Trying to remember which previous aircraft this one replaced?
For Marine use it replaced the CH-46 Sea Knight, known as the "Phrog."
For the Air Force, it replaced the MH-53 Pave Low.
For the Navy, it is in the process of replacing the C-2 Greyhound.
“Trying to remember which previous aircraft this one replaced?”
It didn’t actually replace any specific aircraft, although it was nominally intended to eventually replace the CH-46 and CH-47 helicopters. The ‘46 and ‘47 just cannot match the V-22 in speed to the area of operations...