112th United States Congress | regiment | infantry | Infantry | Parachute Regiment (United Kingdom) | Regiment | Seventh Regiment Armory | Parachute Regiment | Royal New Zealand Infantry Regiment | Gloucestershire Regiment | Devonshire Regiment | The Royal Canadian Regiment | Royal Newfoundland Regiment | Essex Regiment | East Yorkshire Regiment | Royal Sussex Regiment | Royal Anglian Regiment | King's Own Royal Border Regiment | Durham Light Infantry | Cheshire Regiment | 5th Cavalry Regiment | South Lancashire Regiment | Somerset Light Infantry | Royal Tank Regiment | Royal Lincolnshire Regiment | Princess Patricia's Canadian Light Infantry | Oxfordshire and Buckinghamshire Light Infantry | Duke of Wellington's Regiment | Canadian Airborne Regiment | 7th Canadian Infantry Brigade |
Commissioned in 1942 via the ROTC program at Texas A&M, Leonard was serving as a platoon leader in Company C, 893rd Tank Destroyer Battalion, which was attached in October 1944 to support the 112th Infantry Regiment of the 28th Infantry Division during that unit's assault on the Siegfried Line through the Hürtgen Forest area along the German-Belgian border.