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.
VMMT-204 currently operates both the older Block A and newer Block B versions of the MV-22 Osprey. The Block A version was initially deployed before receiving reliability upgrades, which were then incorporated into the Block B version. Despite being less reliable and logistically supported than the newer aircraft, VMMT-204 has successfully completed its training requirements.