The "1000 ft arming on Aces High" is for a set distance to keep it simple. Having loaded more bombs on F4-B Phantom's ( USMC)during the Viet Nam war than I care to remember, I will say this, the fuses can be set to different times to go off. It's the revolutions on the spinner that lines up the inside to arm it. We used snake eye fins to retard the fall so the pilots could drop low and get out before the bomb exploded. Belly landing with ordnance is a bad idea even if the bombs are not armed. I guess the game is designed so you don't have to worry about it. One more thing, the spinner on the fuse had a wire run through one of the blades and the wire run through a blade that was stationary and attached to the bomb rack, so it would not spin till released
P.S. It's ordnance, with out the :i: