The Washington AADCPs at Suitland & Ft Meade were deactivated on September 1 , 1974 ; .
USAF air defense operations at Ft Meade ended October 1 , 1979 ( a plan to use the site in the 1983 Joint Surveillance System was not implemented ) .
The Washington AADCPs at Suitland & Ft Meade were deactivated on September 1 , 1974 ; and USAF air defense operations at Ft Meade ended October 1 , 1979 ( a plan to use the site in the 1983 Joint Surveillance System was not implemented ) .