From AAF Manual 35-0-1, Revised through July 1, 1945 :
MOS 1024
Pilot, Four-Engine
Pilots four-engine aircraft and commands crew. Ascertains, prior to mission, that aircraft has been properly inspected by crew members; takes off, operates, and lands airplane under varying flying conditions and such hazards as adverse weather, enemy attacks, and low-altitude and night flying; maintains flight records and reports observations made during mission.
Must have thorough knowledge of general and local flying regulations and meteorology. Must meet prescribed physical standards.
Must be a rated pilot and have completed transition training in four-engine aircraft.
MOS 1051
Pilot, Two-Engine
Pilots two-engine aircraft and commands crew. Ascertains, prior to mission, that aircraft has been properly inspected by crew members; takes off, operates, and lands airplane under varying flying conditions and such hazards as adverse weather, low-altitude and night flying; maintains flight records and reports observations during mission.
Must have thorough knowledge of general and local flying regulations and meteorology. Must meet prescribed physical standards.
Must be rated pilot and have completed transition training in two-engine aircraft.
Note about the only difference between the two as far as operations go is the four-engine mentions " under enemy attack ", while the two-engine does not. I would guess this was because the 4-engine would usually be a bomber, while the 2-engine would be a cargo type.
GO 75 WD 1945 tranlates to " General Order No. 75, War Department, 1945 " This would be the 75th General Order issued by the War Dept. in 1945 .... they started off each new year at GO No. 1 "
Same for GO 22 WD 1945...... These General Orders specified exactly by dates and physical boundaries what constituted the various Campaigns during WWII. For example, one might say " From latitude XXX.XO and running SSE in a line 1000 miles, then in a line following longitude XX.XX 725 miles, then ..... " etc.
The China Defensive dates were 2 July 1942 to 4 May 1945.
India-Burma Campaign was 2 April 1942 to 28 Jan. 1945.
So, and military personnel assigned to duty within the prescribed boundaries, during the prescribed times, would be eligible for the corresponding Campaign credit.
See links for histories of both campaigns below.
http://www.history.army.mil/brochures/72-38/72-38.HTMhttp://www.ibiblio.org/hyperwar/USA/USA ... index.html