E 3 to e 4 air force July 8, 2019 16 32 64 128 E 3 to e 4 air force pay E 3 to e 4 promotion requirements air force How long to go from e 3 to e 4 air force How long from e 3 to e 4 in air force How long to promote from e 3 to e 4 air force How long does it take to go from e 3 to e 4 air force