[2] At the beginning of the Second World War he joined the Royal Navy's boys' training establishment HMS Ganges.
He finished the war in Kiel repairing damage to make the port usable again, with the rank of Lieutenant.
[2] After the war, Reeman joined the Metropolitan Police, serving as a beat officer and later in the Criminal investigation department.
At the end of the war he joined London County Council as a child welfare officer, but remained a Lieutenant-Commander in the Royal Naval Reserve.
Reeman also wrote a series of novels about several generations of the fictional Blackwood family who served in the Royal Marines from the 1850s to the 1980s, and a non-fiction account of his own Second World War experiences, D-Day: A Personal Reminiscence (1984).