|Mission type||Infrared early warning|
|Operator||United States Air Force|
|Start of mission|
|Launch date||7 May 2011, 18:10UTC|
|Rocket||Atlas V 401 AV-022|
|Launch site||Cape Canaveral, SLC-41|
The SBIRS satellites are a replacement for the Defense Support Program early warning system. They are intended to detect ballistic missile launches, as well as various other events in the infrared spectrum, including nuclear explosions, aircraft flights, space object entries and reentries, wildfires and spacecraft launches.