50 Incredible C-5 Galaxy Facts The Air Force Will Use The C-5 Galaxy Until 2040 1. The United States Air Force spearheaded a Reliability Enhancement and Re-engining Program (RERP) to keep the C-5 in the air until 2040. Now checkout these Best Images of Aircraft Nose Art. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50