On 11 January 1991, Pocius swore an oath to the Republic of Lithuania in the restored Parliament. As a soldier-volunteer he defended Parliament of Lithuania the January Events and the August coup. In March 1991 he joined Voluntary Service of National Defence. On 30 December 1991, as Deputy Chief of Staff of Voluntary Service of National Defence, Pocius was promoted to the rank of Major. In 1993, Pocius was promoted to the rank of lieutenant colonel. In 1994, Pocius was assigned as a commander of Voluntary Service of National Defence.