In 2014, he commanded the "Hvozdyk" battery of 122 mm self-propelled artillery systems in Donetsk region, and later in the 90th separate airmobile battalion (Konstantinivka).

At the beginning of the full-scale Russian invasion of Ukraine, he was the deputy commander of the 503rd Separate Marine Battalion, which was located in the Mariupol sector.

In March 2022, in the battles near the village of Zachativka, the battalion he commanded inflicted significant losses on the Russian invaders.

After the enemy threw reserves into the battle, according to the military unit: "With his last order, the officer called for fire at the coordinates where the largest concentration of occupants was.

On the same day, it was established that Major Oleh Chornomorets called the fire on himself and died defending his country, giving his own life to save his comrades-in-arms".