The U.S. Air Force can Ill afford to lose a C-5 Galaxy since the line to build them has long been closed. They are
extreamly important for strategic Airlift because they are our only aircraft that can carry the M1 Abrams main battle tank.
I think the Air Force should get approval to build some new C-5 Galaxy size air craft to continue with that mission. They are very expensive planes but the money is well spent.
The C-17 can carry an Abrams.