USMC is Chinooks?? The Osprey pilots are gonna be shocked.
Unless the US Army was air logistics, the USMC flies a similar but smaller twin rotor helicopter.
The Ch-46 the USMC flies is not technically a Chinook.
Both the Sea Knight (CH-46) and the Chinook (CH-47) came from the Vertol (now Boeing) V-107 design of 1958.
The difference is the Army had theirs sized up about 30% with bigger engines and rotors.
Both in service since 1962 with MANY original air frames still flying.
It’s hard to improve a perfect design.
One would have to know the history to spot the difference.
Of note: the USMC has replaced all it’s assault variant CH-46Es with the MV-22 Osprey.
It has 33% more payload, twice the range and twice the speed.
Speed matters for assault troops, and so does range.
While the CH-46E could have put those Marines in Baghdad from Kuwait, it would have taken two hours instead of one. And the helos would have to refuel before going home.
The Osprey completed the mission in an hour after liftoff and didn’t have to refuel.