Serco has been awarded a $38 million U.S. Army contract to upgrade the High Altitude Electromagnetic Pulse, or HEMP, protection portion of the Ballistic Missile Early Warning System radar, the company announced Friday.

The system supports the mission at Thule Air Force Base in Greenland, the company said in a statement.

The five-year contract was competitively bid and awarded under the Corps of Engineers.

Serco will enhance and modernize the radar's HEMP protection with a design-build-install-test approach supporting U.S. Air Force Space and Strategic commands.

Serco has upgraded HEMP systems at Clean Air Force Station, Alaska, Cavalier Air Force Station, N.D., Cape Cod Air Force Station, Mass., and RAF Flyingdales in the U.K.

A High Altitude Electromagnetic Pulse can be produced by a nuclear explosion high in the atmosphere, and could be used in cyber warfare or by terrorists to disrupt communications and critical U.S. infrastructure, a Congressional Research Service report states.