i'm not talking about guns. 500 rounds of 20mm carried internally in an A-7 or an F-16 is not going to impact the aircraft weight significantly, and won't affect the drag. but hanging unnecessary stuff on the wings is a serious detriment to getting across the ocean.I'm way too crooked to ever be straightened out. Thinking back to going from AK to Korea with some A-10s, I don't recall unloading the 30mm for the flight nor do I recall uploading live ammo upon landing. But my memory of things 35 years ago can be a bit hazy. Two fuel tanks and a travel pod under the wings. Any full ammo downloaded from an A-10 has to be replaced with empty casings to keep the aircraft from setting on its tail.