 As of the end of 2007, VMMT-204 has trained over 150 MV-22 pilots for the first three Marine Corps MV-22 squadrons, and the first USAF CV-22 squadron.VMMT-204 currently operates the block A and B versions of the MV-22 - the block A aircraft preceded the reliability upgrades designed into the block B version, getting delivered to warfighting squadrons first.Although the block A aircraft is less reliable and less logistically supported than the newer aircraft, VMMT-204 has been able to complete its training requirements.