The last missiles left the base in 1991 as a result of the Intermediate - Range Nuclear Forces Treaty .
The camp remained in place until 2000 , after protesters won the right to house a memorial on the site .
The last missiles left the base in 1991 as a result of the Intermediate - Range Nuclear Forces Treaty , but the camp remained in place until 2000 , after protesters won the right to house a memorial on the site .