harrym,
AFAIK, most of the air traffic over India and Burma during WWII was fairly low; 7-8000 ft providing a nice "Hill Station" climate in the cockpit in the hot weather. As there was nothing in India above 12,000 ft (if you keep away from the Himalayas - and there was no reason to go up there), I never heard of anyone using oxygen except, I suppose, the stalwarts who flew "over the Hump" to China.
Whatever zoologists may say, the only good krait is a dead krait IMHO. I had my kukri to cut my way through vegetation in the event of having to walk back. You were short-changed on your .38 ammo issue, I got 18 rounds in a little cardboard box, carted it all round for three years and handed it back untouched.
Blazing away into the sky in a
feu-de-joie is all right, but a Bad Idea if up through the basha roof, as it may bring down invertebrates
much better left where they are ! (And I hope you cleaned your pistol afterwards !)
Cheers, Danny