Foley joined the
Special Air Service as an
enlisted man during his
National Service. He served in BRIXMIS during the 1970s. He was
commissioned into the
Rifle Brigade in 1959 and rose to become
Director SAS in 1983. He was later Director of General Intelligence, which involved ensuring intelligence provision in the theatre of war and making assessments for government ministers at the time of the
Gulf War in 1990, and became
Commander of British Forces in Hong Kong in 1992, before being named
Chief of Defence Intelligence in 1994. He left that post, retiring from the Army three years later, in 1997. ==Later life==