Every branch of the U.S military and all major allied powers flew the C-47. The U.S. Navy version was the R4D. R4D modifications included a reinforced fuselage floor, the addition of a large cargo door, the fitting of cargo hooks beneath the center wing section and the removal of the tail cone to mount a hook for towing gliders. As a troop transport, the R4D carried 28 soldiers in full combat gear.