Stats: Delta 4 history and backlog (updated March 30)

Orbital ATK’s next commercial resupply freighter going to the International Space Station will be named the S.S. John Glenn, paying tribute to the legendary first American to orbit the Earth.

The United Launch Alliance Atlas 5 rocket was rolled to the pad today at Cape Canaveral’s Complex 41 in preparation for Friday’s liftoff. The flight will deliver the Mobile User Objective System satellite No. 5 into orbit, fulfilling a five-launch, four-year effort to assemble the military’s secure smartphone mobile communications network. Launch is scheduled for 10:30 a.m. EDT (1430 GMT).

The United Launch Alliance Delta 4 rocket, standing 206 feet tall and and weighing 720,000 pounds, unleashes 1.1 million pounds of thrust from its main engine and two side-mounted boosters at 12:52 a.m. EDT (0452 today to launch the GSSAP No. 3 and No. 4 satellites for the Geosynchronous Space Situational Awareness Program from Cape Canaveral.