Now here is something you may not know: M-856 5.56mm tracer ammunition for M-16s come in cartons of 30 rounds IIRC which you can self mix in your magazines. Individual rifleman may fill the first five rounds (last five shots) as tracers as a low ammo indicator. Team, Squad and Platoon Leaders may have one magazine that is ALL tracer to designate targets.
The faster and lower you fly consumes your fuel faster decreasing your range and flight time. Assuming you can avoid flight paths of other aircraft without outside assistance from Air Traffic Controllers (ATC), you need to land before your fuel runs out.