Photos: Tuesday’s Atlas 5 rollout

A Soyuz rocket blasted off from Russia’s northern cosmodrome Sunday, adding another satellite to the nation’s Glonass navigation fleet to replace an aging spacecraft.

The mission, dubbed Cert-2 by United Launch Alliance, is the final mission required before the rocket can begin launching national security missions. Liftoff is set for the beginning of a three-hour window at 6 a.m. EDT (1000 UTC).

A pair of Air Force surveillance satellites headed to geosynchronous orbit today to reconnoiter the high ground, departing Cape Canaveral aboard a United Launch Alliance Delta 4 rocket at 12:52 a.m. EDT (0452 GMT). It is the 375th Delta rocket flight since 1960.