The mission of the 691 ISR Group is to execute operations providing intelligence, surveillance and reconnaissance to national decision makers, while providing planning, programming, logistics, and systems engineering expertise to execute cryptologic missions, in addition to promoting community relations and public affairs initiatives within a multinational and multi-service environment.

The group was first activated in June 1988 as the 691st Electronic Security Wing at Lindsey Air Station, in Wiesbaden, Germany.

The wing worked with the 66th Electronic Combat Wing to integrate ESC's assets and support forces into the exercises, activities and war plans of United States Air Forces Europe and NATO.

At Menwith Hill, the 691st Group provided cryptologic liaison support to the United Kingdom Ministry of Defence's largest operational field site, as well as maintaining liaison activities for allied information operations.

[2] This article incorporates public domain material from the Air Force Historical Research Agency