Delta IV Heavy Upgrade 45 t

American orbital launch vehicle. Proposed upgrade to Delta IV Heavy by adding 6 GEM-60 solid rocket boosters, RS-68B upgraded engines to the core vehicles, and an AUS-60 upper stage powered by 1 MB-60 or RL-60 27 metric ton thrust LOx/LH2 engine. 6.5 m diameter payload fairing. Introduction would require modifications to existing launch pads.

LEO Payload: 41,000 kg (90,000 lb) to a 407 km orbit at 28.50 degrees. Payload: 15,000 kg (33,000 lb) to a earth escape.