On that day, in Saulx de Vesoul, France, he repeatedly exposed himself to hostile fire in order to attack the German forces, even after being wounded.

First Lieutenant Tominac's official Medal of Honor citation reads: For conspicuous gallantry and intrepidity at risk of life above and beyond the call of duty on September 12, 1944, in an attack on Saulx de Vesoul, France 1st Lt. Tominac charged alone over 50 yards of exposed terrain onto an enemy roadblock to dispatch a 3-man crew of German machine gunners with a single burst from his Thompson machinegun.

Plainly silhouetted against the sky, painfully wounded, and with the tank burning beneath his feet, he directed bursts of machinegun fire on the roadblock, the SP gun, and the supporting German infantrymen, and forced the enemy to withdraw from his prepared position.

Calling upon a sergeant to extract the shell fragments from his shoulder with a pocketknife, he continued to direct the assault, led his squad in a hand grenade attack against a fortified position occupied by 32 of the enemy armed with machineguns, machine pistols, and rifles, and compelled them to surrender.

His outstanding heroism and exemplary leadership resulted in the destruction of 4 successive enemy defensive positions, surrender of a vital sector of the city Saulx de Vesoul, and the death or capture of at least 60 of the enemy.The Maple Street Bridge in Johnstown, Pennsylvania, in his home county of Cambria County, was named the Colonel John Joseph Tominac Memorial Bridge in his honor.