Became part of the United States Air Forces in Europe performing occupation duty in Germany while squadron demobilized personnel in 1945.
After being demobilized Gerrard studied at the Manchester School of Art in 1919 and at the Slade School of Fine Art from 1920 where Henry Tonks was his teacher and contemporaries included Samuel Rabinovitch.
He was replaced by his assistant, Brigadier-General E.A. Wood, who commanded the Division until it was demobilized.
On 1 May 1919 he was demobilized from the Royal Air Force and formally joined the Bristol Aeroplane Company and the same day made the first post-war civil air flight in Britain when he flew the Bristol Company's general manager, Herbert Thomas, from Filton to Hounslow in a Bristol Tourer.
Under such pressure, the South African foreign minister, Pik Botha, announced on 28 September 1989 that some 1,200 ex-Koevoet members of SWAPOL would be demobilized the next day.
Senior Officer of the Division of Programme Support at Headquarters during 1998–99; Chief of Operations in Guatemala responsible for the return and reintegration of former combatants of the National Revolutionary Unit of Guatemala and refugees in 1997; Program Manager in Haiti for the return and reintegration of vulnerable populations as well as demobilized members of the Armed Forces of Haiti (1994–96).
On 9 May 1832, he was transferred to Gratz, where he was demobilized on 8 May 1834 with a pension on 500 florins.
Most of the demobilized guerrillas formed Esperanza, Paz y Libertad (Hope, Peace and Liberty), a political party, which claimed to defend the interests of workers and labor unions, especially around the Urabá area in the departments of Antioquia and Córdoba.
After the Macedonians were defeated and he had returned home as his unit was demobilized, he promptly went to Spain as a volunteer under the consulship of Marcus Porcius Cato (195 BC).