Lockheed Martin has integrated two of the most important components onto its fourth Mobile User Objective System (MUOS) satellite for the U.S. Navy. Recently engineers mated the multi-beam assembly, which hosts 16 ultra-high frequency (UHF) antennas for distributed, global communications coverage. Earlier this year, the team delivered and integrated the vehicle’s communications system module. With bus and payload now together, the satellite is entering its first system check-outs before progressing to environmental test.