[4][5][6] In 1940, Tennant signed up for the Royal Australian Air Force (RAAF), which put a temporary pause to his footballing career.
[3][7] Returning to Australia in 1944, Tennant joined Sydney team North Shore as a playing coach.
[7][8] Tennant played one full international match for Australia in a 6–4 defeat of New Zealand in Sydney in 1933.
[9][10] After retiring from playing, Tennant became a coach, taking charge of his former club Metters in 1950.
[11] Tennant was selected as Australia coach alongside Viv Chalwin for matches against a Hong Kong Chinese XI in 1953.