The following is in response to a question from Andrew Brown in the thread about flak efficiency. I posted it here to make it available to all who're interested in this kind of stuff. I'm rather trying to achieve an adequate representation of flak in future mod (because this seems to be a problem) than to simply present OOB/TOE stuff. Ostensibly the "vanilla" game tried to represent AA with the various base forces, but the base forces seem to lack many assets that were available to the Allies and Japan during the Pacific War.
I started with British anti-air units here, because I have the most material about them. Something about Japanese, US, and Australian AA units should follow.
British AA Organization
There were two categories of British AA regiments: Heavy (HAA) and Light (LAA). The term "regiment" actually stood for battalion sized formations in the Royal Artillery.
HAA had three heavy batteries of 8 guns each. Generally they were equipped with 3.7in AA guns (in the ETO some received 4.5in and even 5.5in AA guns, but it seems that the regiments in SE Asia never received such heavy/immobile equipment). Thus a HAA regiment contained 24x 3.7in AA guns.
There were two variants of LAA in the RA, both having 3 light batteries. The first variant had 3 batteries of 40mm Bofors, the other variant 3 batteries of 20mm Oerlikon. There were (as far as I can tell) never regiments that contained a mixture of Bofors and Oerlikon guns. A Bofors battery had 18x 40mm Bofors, a Oerlikon battery 16x 20mm Oerlikon (in some cases in the ETO 20mm Polsten, Vickers, or Hispano-Suiza guns). Thus a Bofors-equipped LAA had 54x 40mm Bofors while a Oerlikon-equipped LAA had (only) 48x 20mm Oerlikon. But I've yet to see a British AA unit present in SE Asia that was equipped with 20mm guns (there're some data available about units in Malaya and Burma), currently it seems that all were Bofors-equipped.
Individual AA units
The following does not list independent AA batteries. There's not much available about them, just that some where located at Colombo and Trincomalee (at least one at each location).
3rd British HAA as well as 1st HAA, 2nd HAA and 3rd LAA Regiments HKSRA (Hong Kong Singapore Royal Artillery) and 1st Indian HAA were stationed at Singapore on Dec 7th 1941. 2nd Indian LAA was part of the garrison of Penang. 5th British HAA and 1st AA Rgt HKSRA (not to be confused with 1st HAA HKSRA) were at Hong Kong.
6th HAA and 35th LAA (btw, together with 85th AT Rgt) reached Singapore with Convoy DM 1 (ex Convoy WS 12 ZM from the UK) on Jan 13th 1942 (DM 1 had departed Durban/SA Dec 24th 1941). Both AA Rgt were evacuated to Java later, but they left most of their AA guns behind.
77th HAA, 21st LAA and 48th LAA arrived at Batavia on Feb 4th 1942 with Convoy DM 2 (ex Convoy WS 14 B from UK, left Durban Jan 13th 1942). Original Destination had been Singapore, but convoy was diverted to Batavia. 77th HAA was equipped with 3.7in AA guns, 21st and 48th LAA with 40mm Bofors. 77th HAA was full-strength (3 batteries with 24 3.7in altogether) and it seems that 21st and 48th LAA were at least full-strength (3 batteries with 54 40mm Bofors each) when they arrived at Batavia but later gave some of their guns to 35th LAA when it arrived without guns from Singapore.
All AA regiments that went to Java were captured there and not reformed!
67th HAA arrived in India in February 1942 from North Africa. According to Wavell, it arrived without any guns because these were left behind in North Africa (there're some quite funny remarks from him about this, ostensibly the Middle East Command simply diverted the guns for its own use before the regiment departed to India!).
The following list comes from "British Artillery Regiments of Second World War" by Malcolm A. Bellis. Bellis does not list the exact arrival times in India/Ceylon but the date of assignment to AA Brigades or commands. Some of the listed AA regiments may have arrived some weeks earlier in India. All of the following units came from British Home Defense Command and were most likely at full strength when they arrived (and all had participated in the Battle of Britain in 1940).
56th HAA, 95th HAA, 24th LAA, 28th LAA arrived in India, and 43rd LAA at Colombo in March 1942.
59th, 60th and 118th LAA arrived in India in April 1942.
53rd HAA, 70th HAA, 69th LAA, 77th LAA arrived in India, and 52nd HAA and 69th LAA at Colombo in May 1942.
66th HAA arrived in India, and 55th LAA at Colombo in June 1942.
8th HAA and 44th LAA arrived in India and 23rd LAA at Colombo in July 1942
36th and 78th LAA arrived in India in August 1942
118th LAA arrived in India in April 1943
101st HAA arrived in India in July 1943
122nd LAA arrived in India in June 1943
No AA regiments did arrive later. Some LAA were combined with AT Rgt to form LAA/AT regiments in 1943 for use with infantry divisions, but their overall strength did not change. 95th LAA came under suspended animation in March 1944 due to manpower shortages.
Sources are mainly Malcolm A. Bellis (see above) and reports from Wavell and Brooke-Popham published in the London Gazeteer.
< Message edited by Kereguelen -- 10/12/2005 4:10:59 PM >