well if you are going to be technical, why instruments? the only measuring devices in the game are the compass on everyones hud and the altimeter next to the wheel. nor are all of them designed for careful exacting work implicit in the definition somthing made for a particular purpose, and if you are ignoring the implied context everything is an instrument. your pilot doesnt actually have tools on him/her besides their repair one, but rather activates different equipment around the ship that is designed to help him/her pilot. hence piloting equipment.
further more, munitions means the guns as well as the ammo, a more accurate word would be ammunition, or simply ammo, as the gunner only takes the ammo in that area being labled. furthermore, gunnery is the USE of large military guns, implying the study of how large military guns can be used effectively. as the ammo in the slot being labled changes flight patterns, damage done, and ammo capacity, gunnery is actually a rather apt word to use.
yeah the words could be changed but i feel they dont really matter because everything is explained by the pictures themselves.