World Naval Ships Forums  
CURRENT SPECIAL OFFERS ON OUR HUGE SELECTION OF ART PRINTS!

Go Back   World Naval Ships Forums > Naval History > Japanese Ships and Crews
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Japanese Ships and Crews Topics relating to a specific Japanese ship or ships.

Reply
 
Thread Tools Display Modes
  #1  
Old 10-04-2010, 17:26
Roy M. Stanley II Roy M. Stanley II is offline
Able Seaman
 
Join Date: Feb 2010
Posts: 10
Default Meaning of Abbreviation

I have a XXI Bomber Command target chart of ships Kure, Japan in April 1945 showing BB Haruna and two camouflaged vessels annotated "OCA." Both ships scale out at about 400 feet length. One is next to the shore, the other in deep water. I can see enough of one to believe it is a warship but the other may be a mership.
Can anyone tell me what the "OCA" stands for?
Reply With Quote
  #2  
Old 10-04-2010, 19:08
steve roberts steve roberts is offline
Crossed the Bar
 
Join Date: Dec 2009
Location: gosport hampshire uk
Posts: 2,133
Default Re: meaning of abbreviation

Hi Roy.My Father flew with Bomber Command during the war.He often talked about being brief on alternate targets of opportunity,meaning if the main target was obscured they could bomb designated targets of opportunity.What I think OCA may Stand for is OPERATIONAL CONTROL AUTHORITY.Meaning that IJNS HARUNA would be the main target of attack,but by that time of the war,bombing tended to be fairly accurate and if the prime target was destroyed the "Master Bomber" could ask for the other two ships to be attacked by aircraft still to bomb the main target.Of course we (The British) did not have heavy bombers in the Far east.Hope this might help you out,it is of course IMHO only.
Regards Steve.
Reply With Quote
  #3  
Old 10-04-2010, 19:39
Don Boyer's Avatar
Don Boyer Don Boyer is offline
Forum Moderator.
 
Join Date: Sep 2009
Location: Haleiwa, Hawaii (North Shore of Oahu)
Posts: 3,714
Default Re: meaning of abbreviation

In the United States naval jargon of WWII, the "O" designation was often used to designate and "old" type of ship: for example, the Pearl Harbor Battleships renovated and used for shore bombardment were often designated as "OBB" to differentiate them from the new fast battleships, which retained the standard "BB" designation.

Not being able to look at your chart (any chance you could post it? It's historically very interesting!) I would bet the "OCA" refers to the old sister cruisers (CA) Iwate and Izuma, both sunk in shallow water at Kure, one close to shore and one farther out in the bay.

That would be my best guess, given the jargon of the day.

By the way, ANY item floating in any part of Japan was a legitimate target in 1945, but of course the big battleships and carriers led the list. The US Navy committed many airstrikes at the end of the war to hunting down and sinking the remaining ships of the Imperial navy. Only the atomic bombs stopped them from their goal of sinking every single ship belonging to the Japanese navy, a goal the USN set itself (unwritten, unspoken) on December 7, 1941. The Army Air Force did its share as well. Many thought these strikes a waste, as they could have been directed at destroying the kamikaze threat, but I personally feel that it wasn't much of a distraction and clearly demonstrated at least the United States Navy's commitment to compliance with their prime directive -- "execute unrestricted air and submarine warfare against the forces of Japan."
__________________
Don Boyer, GMT-2,
USS Bon Homme Richard (CVA-31)

"With 2000 years of examples behind us we have no excuse, when fighting, for not fighting well." T.E. Lawrence
Reply With Quote
  #4  
Old 12-04-2010, 14:26
Roy M. Stanley II Roy M. Stanley II is offline
Able Seaman
 
Join Date: Feb 2010
Posts: 10
Default Re: Meaning of Abbreviation

Whole graphic is too big for this site. This cut-down section shows the two camouflaged ships and annotations.
Attached Images
File Type: jpg kure 6 jul 45.jpg (323.3 KB, 64 views)
Reply With Quote
  #5  
Old 13-04-2010, 03:37
Don Boyer's Avatar
Don Boyer Don Boyer is offline
Forum Moderator.
 
Join Date: Sep 2009
Location: Haleiwa, Hawaii (North Shore of Oahu)
Posts: 3,714
Default Re: Meaning of Abbreviation

No idea at all what ships those could be -- can't find anything recognizably comparable in Fukui's book. Blows my OCA definition out of the water, though, as neither of those targets matches the old cruisers I was thinking of...

Regards...
__________________
Don Boyer, GMT-2,
USS Bon Homme Richard (CVA-31)

"With 2000 years of examples behind us we have no excuse, when fighting, for not fighting well." T.E. Lawrence
Reply With Quote
  #6  
Old 13-04-2010, 05:11
patroclus's Avatar
patroclus patroclus is offline
Admiral
 
Join Date: Mar 2009
Location: Australia
Posts: 2,320
Default Re: Meaning of Abbreviation

OCA in modern usage (e.g. "Desert Storm") is Offensive Counter Air installations. Presumably these were Anti-Aircraft capable ships.
Reply With Quote
  #7  
Old 13-04-2010, 05:44
MelQuick's Avatar
MelQuick MelQuick is offline
Rear-Admiral
 
Join Date: Jan 2010
Location: Worthing, West Sussex
Posts: 1,468
Default Re: Meaning of Abbreviation

From some of the stints I did in the service, it could have stood for On Call Always!

Mel
Reply With Quote
  #8  
Old 12-04-2012, 05:14
FlasherTM FlasherTM is offline
Able Seaman
 
Join Date: Jul 2011
Posts: 11
Default Re: Meaning of Abbreviation

OCA (3) is most likely target ship Settsu and OCA (4) is most likely Izumo since it looks like she is capsized. Iwate sank upright in shallow water near shore.
Reply With Quote
  #9  
Old 12-04-2012, 10:09
BlackBat242's Avatar
BlackBat242 BlackBat242 is offline
Vice-Admiral
 
Join Date: Aug 2011
Posts: 1,516
Default Re: Meaning of Abbreviation

Quote:
Originally Posted by FlasherTM View Post
OCA (3) is most likely target ship Settsu and OCA (4) is most likely Izumo since it looks like she is capsized. Iwate sank upright in shallow water near shore.
Except you can still see what looks like 3 funnels & a pair of masts on #4, along with having ends different from the center half of the ship. You can eve see darker areas that look like the two ships' boats in the pic below.

So it might be Iwate or Izumo.
Attached Images
File Type: jpg IJN Iwate at Plymouth 1900.jpg (444.2 KB, 16 views)
__________________
Only a fool fights in a burning house. __ Jon A., Sgt USMC '81-'89; CV-61 USS Ranger '85-'87
Reply With Quote
  #10  
Old 13-04-2012, 01:24
WGVSr WGVSr is offline
Vice Commodore
 
Join Date: May 2011
Location: Tennessee, USA
Posts: 779
Default Re: Meaning of Abbreviation

I support Don's theory. In the vernacular of the period, ca. 1945, OCA stood for either old heavy cruiser or old cruiser, armored, which would fit the classification of the old Japanese armored cruisers. Both Izumo and Iwate were sunk at Kure in late July, 45. Azuma was badly damaged at Kre in mid-July. Settsu was sunk the same time as Iwate but all were done in by naval aviation from TF 38. Had the Settsu been specifically identified, she'd probably be noted as an OBB.
Bill
Reply With Quote
Reply



Ship Search by Name : Advanced Search
Random Timeline Entry : 5th January 1907 : HMS Illustrious : Flagship of Rear-Admiral George A. Callaghan

NAVAL PRINTS

Click above to see our naval art portal - Eight random half price items are displayed to the right.

Some Current Half Price Offers

 Forming part of the Eastern Task Force covering the landings at Normandy in June 1944, the cruiser HMS Mauritius is shown in company with the monitor HMS Roberts and the cruiser HMS Frobisher shelling German batteries at Merville, Houlgate and Benerville as the combined British and American forces embark upon what would become known forever as D-Day.

Operation Neptune by Ivan Berryman (P)
Half Price! - £500.00
 The Japanese ship Takao at Flank speed, riding shotgun for the carrier

Flank Speed by Randall Wilson.
Half Price! - £35.00
 HMS Medway was the first Royal navy submarine Depot ship that was designed for the purpose from the outset. She is shown here with a quintet of T-class submarines on her starboard side, whilst an elderly L-Class begins  to move away having completed replenishment. HMS Medway was sunk on 30th June 1940 having been torpedoed by U-372 off Alexandria.

HMS Medway by Ivan Berryman
Half Price! - £15.00
The pride of the Royal Navy, HMS Hood, passes Gibraltar on her way to join HMS Prince of Wales at Scapa Flow and onto her short and tragic engagement with the German battleship Bismarck.

HMS Hood Passing Gibraltar by Brian Wood (P)
Half Price! - £1600.00

 The heavy cruiser HMS Dorsetshire is brought up to sink the blazing wreck of the Bismarck with torpedoes at around 10:30 hours on the morning of May 27th 1941.  The once proud German ship had been ruthlessly pounded into a twisted and burning wreck by the British battleships Rodney and King George V.  HMS Dorsetshire and HMS Maori combed the area of the sinking for survivors, between them picking up a total of 110 out of an original complement of 2,300

HMS Dorsetshire (The End of the Bismarck) by Ivan Berryman. (AP)
Half Price! - £25.00
B63AP.  HMS Malaya at Capetown by Ivan Berryman.

HMS Malaya at Capetown by Ivan Berryman (AP)
Half Price! - £25.00
 The heavy cruiser Prinz Eugen slips quietly through the waters of Kiel Harbour as one of her own Arado Ar.196s flies overhead. In the background, Bismarck, wearing her Baltic camouflage, is alongside taking on supplies.

Prinz Eugen by Ivan Berryman (AP)
Half Price! - £25.00
On 17th June 1944, 780 miles west of Saipan in Mid Pacific, the Gato class submarine USS Cavalla dives after a lucky sighting of a Japanese Naval Task Force, which included the aircraft carriers Taiho, Shokaku and Zuikaku. The Cavalla then trailed the Japanese, attacking and sinking the Shokaku on the 19th.

A Chance Encounter by Robert Barbour.
Half Price! - £35.00

SPORT PRINTS

Click above to see our sport art portal - Four random half price items are displayed to the right.

Some Current Half Price Offers

 Eddie Irvine and Johnny Herbert.  Jaguar Cosworth R1s

Return of the Cat by Michael Thompson
Half Price! - £25.00
SPC5003. Rory Underwood by Rodger Towers.

Rory Underwood by Rodger Towers.
Half Price! - £60.00
The legendary Welsh rugby union captain Gareth Edwards is brought to life in the triple portrait. Gareth Edwards is revered in Wales and considered one of the finest players ever. in part of the montage he is shown going over for a try against England.
Gareth Edwards by Darren Baker. (Y)
Half Price! - £75.00
Celebrating Sir Alexs magnificent orchestration of Manchester Uniteds historic treble cup success of 1999.

Sir Alex Ferguson by Darren Baker.
Half Price! - £50.00

AVIATION PRINTS

Click above to see our aviation art portal - Four random half price items are displayed to the right.

Some Current Half Price Offers

 Routine, though essential, maintenance is carried out on a 501 Sqn Hurricane at the height of the Battle of Britain during the Summer of 1940.  Hurricane P3059 <i>SD-N</i> in the background is the aircraft of Group Captain Byron Duckenfield.

Ground Force by Ivan Berryman.
Half Price! - £70.00
 F-4C Phantom II of Colonel Robin Olds of the 8th Tactical Fighter Wing, January 1967.

Colonel Robin Olds by Ivan Berryman. (P)
Half Price! - £725.00
 A pair of Focke Wulf 190A4s of 9./JG2 Richthofen based at Vannes, France during February 1943. The nearest aircraft is that of Staffelkapitan Siegfried Schnell. The badge on the nose is the rooster emblem of III./JG2 and the decoration on Schnells rudder shows 70 of his eventual total of 93 kills.

Looking for Business by Ivan Berryman. (C)
Half Price! - £105.00
 The success of the attack on the Möhne dam on the night of 16th/17th May 1943 meant that the remaining three 617 Sqn Lancasters of the First Wave could turn their attention to the Eder, some twelve minutes flying time away.  Wing Commander Guy Gibson first called in Flight Lieutenant D J Shannon, flying AJ-L (ED929G) to make the initial run, but he had great difficulty achieving the correct height and approach, so Gibson now ordered Squadron Leader H E Maudslay in AJ-Z (ED937G) to make his run.  Again, the aircraft struggled to find the correct height and direction, so Shannon was again brought in, AJ-L finally releasing its <i>Upkeep</i> on the third attempt. The bomb bounced twice before exploding with no visible effect on the dam. Now Maudslay made another attempt, but released his bomb too late.  The mine bounced off of the dam wall and exploded in mid air right behind AJ-Z, the Lancaster limping away, damaged, from the scene, only to be shot down on the way home with the loss of all crew.  Finally, Pilot Officer Les Knight was called in for one final attempt. AJ-N (ED912G) released its <i>Upkeep</i>  perfectly, the mine bouncing three times before striking the dam slightly to the south.  In the ensuing explosion, the dam was seen to shake visibly before the masonry began to crumble and a massive breach appeared.  With the Möhne and Eder dams both destroyed and the Sorpe demonstrated to be equally vulnerable, <i>Operation Chastise</i> had been a remarkable success and will stand forever as one of the most heroic and audacious attacks in the history of aerial warfare.

The Eder Breaks by Ivan Berryman.
Half Price! - £70.00

MILITARY PRINTS

Click above to see our military art portal - Four random half price items are displayed to the right.

Some Current Half Price Offers

 Superb figure study of the 82nd Airborne in 1944.

82nd Airborne by Chris Collingwood.
Half Price! - £80.00
 King Tigers of Kampfgruppe von Rosen, 3rd Company Heavy Tank Battalion 503, preparing to move out from the Tisza bridgehead to counter Soviet pressure on German forces attacking to the northwest at Debrecen during the first battles to defend the Hungarian capital of Budapest.

Tigers in the Mist by David Pentland. (B)
Half Price! - £120.00
 British Crusader MK1 tanks of the 4th County of London Yeomanry Regiment, 22nd Armoured Brigade, charge Axis positions during the opening days of the offensive Bir El Gubi.

Operation Crusader, 18th November 1941 by David Pentland. (P)
Half Price! - £1900.00
 British MK1 Grant tanks of the Staffordshire Yeomanry 8th Armoured Brigade, 10th Armoured Division, breakout from El Alamein.

Operation Supercharge, 4th November 1941 by David Pentland. (AP)
Half Price! - £115.00
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Meaning of VR 2307 on discharge certificate dated 30/06/1918 ccgc1978 Other Naval Topics 1 20-03-2008 20:11


All times are GMT. The time now is 12:01.


Powered by vBulletin® Version 3.6.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.