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.
One of my best friends and my college roommate was a Phrog driver in the Marine Corps for 12 years starting around 1998 or so until 2010. So they were still around for a long time after the Ospreys came along. He did a couple tours in Iraq with the “Battle Phrog”.