 Tuominen was promoted to Sergeant-Major with his score at 18, and became the first FAF holder of the Mannerheim Cross on 18 August 1941.By April 1943 Flight Master Sergeant Tuominen had 31 victories, being transferred to HLeLv 34 equipped with the Bf 109G-2.After the war Tuominen resigned from military service and became a taxi operator.