Its mission is to defend the United States with safe and secure Intercontinental Ballistic Missiles (ICBMs); ready to immediately put bombs on target.

When Eighth Air Force heavy bombers first penetrated Germany on 27 January 1943, the group attacked the navy yard at Wilhelmshaven.

Earned a Distinguished Unit Citation (DUC) for bombing marshalling yards at Hamm on 4 March 1943, despite adverse weather and heavy opposition.

Earned a second DUC for attacking vital aircraft factories in central Germany on 11 January 1944 despite inadequate fighter cover, heavy enemy opposition, and bad weather.

In June 1944, contributed to the Allied invasion of Normandy by bombing gun emplacements and troop concentrations near the beachhead area.

The group supported the Allied crossing of the Rhine River in the spring of 1945 by striking airfields, bridges, and railroads near the front lines.

In addition to bomb damage assessment, targeting and aerial photography for the Bomber Command and FEAF, the 91st conducted ELINT and "ferret" missions in theater.

An example of this type of work was reconnaissance missions which were conducted over Karafuto following reports that the Soviets had built extensive underground installations and missile-launching facilities on the island.

In Project 51, 91st SRW RB-45s took off from Yokota AB, Japan to conduct reconnaissance over the southern portions of Sakhalin Island.