 Complete the following phrase:  After enlisting in the New Zealand Army in 1971, Gardiner attended the Royal Military College, Duntroon in Canberra, graduating as a Bachelor of Arts in 1975, having majored in economics and geography. He then entered the Royal New Zealand Army Ordce Corps, and later served in the Army Office, Canberra. In December 1990 he was appointed commanding officer of the 1st Base Supply Battalion, with the rank of lieutet colonel. He was posted to the 