There may be some missing, because I noticed some seemed to appear inconsistently.
Interestingly, OBJ: codes 145 and above cause Gunship to crash,
the same way that PLATOON: codes above 145 do.

Missing numbers either did not display an object when called, or often displayed an incomplete M1A1 tank.
Explosion, flame and figure sprites are animated.
Hold your mouse cursor over a picture to see its object number.

Note #'s 30, 48 and 78

The file Gunship!/Data/Tiles/Data/airport.txt was edited, so that only the first 5 lines remained. The object values were changed, (5 at a time), and the following mission executed:

TITLE: Airport Objects Blue
BATTLEFIELD: CZECH 46500 125250 0 0 5 25
RED_FRIENDLIES: 90
RED_ENEMIES: 10
BLUE_FRIENDLIES: 90
BLUE_ENEMIES: 10
RUNAI: RED
RUNAI: BLUE
SIDE: 0
PLATOON: 142 44610 121100 270 0 43850 120900 3 701
PLATOON: 28 44720 121050 180 0 44720 121050 0 627
ORDER_ASMBLY_EAST: