Following Ukrainian independence in 1991 Khomchak became a military commander of the Armed Forces of Ukraine. From 1993 to 2000 Khomchak served in the 24th Mechanized Brigade. He was promoted to the rank of lieutenant-general since 2013, participant in the war in Donbas. During the decisively lost by Ukrainian forces Battle of Ilovaisk Khomchak was sectoral commander.