According to internal affairs report all team members equipped with M4 (5,56*45mm standard NATO cartridge), except Collinson. He had MC51??(7.62*51mm Old NATO cartridge). Later Layla Thompson accuses Collinson only team member carrying H&K UMP which only available in 9x19mm, .40SW or .45 ACP.
In the report on the shooting incident at Basra Collinson's rank was given as Sgt; he was a captain.