Major Oszlar joined the Hungarian Defence Forces (HDF) in 1987 and started his military education at “Szolnok” Military Aviation College in Hungary. He was assigned to the 31. “Kapos” Tactical Fighter Wing 1990 as air traffic controller. He graduated on NATO Staff College Joint Command and General Staff Course at Baltic Defence College in 2002. He gained national and international experience in variety of air traffic control duties and positions until 2005. He served in various national and international command post as air traffic and airspace management staff officer 2005 onwards. Currently, he holds the Subject Matter Expert position for Manned Air and Attack Helicopter at the Joint Air Power Competence Centre in Kalkar, Germany.