sentences:  The 231st took part in various civil missions, including the 1961 Nikita Khrushchev visit to the United States, the 1963 Civil Rights March.In 1972, the Flight Facilities Flight was merged into the 231st, and on 8 December 1972 the unit was inactivated and returned to the National Guard Bureau.The unit was renamed the 231st Mobile Communications Squadron (Tactical Air Base) to reflect its standalone capability.