Collyar took command of the 29th Area Support Group, 21st Theater Support Command in July 2002. While in command, elements of the unit deployed to various locations throughout European and Central Command areas of operation in support of OPERATION IRAQI FREEDOM. In July 2004, he returned to the Pentagon as the Chief, Focused Logistics Division, Force Development, Office of the Deputy Chief of Staff G-8. In August 2006, he assumed command of the Defense Distribution Center in New Cumberland, Pennsylvania, a primary level field activity of the Defense Logistics Agency. While in command of the Defense Distribution Center from August 2006 to June 2008, his failure to correct problems in the supply system that had been identified in earlier audits led to the shipment of four electrical fuses for ballistic missile nuclear warheads to Taiwan. Although reprimanded, he was allowed to continue in his position.