According to an article on the Defense Tech website, HMX-1, the Marine Corps chopper squadron that operates the fleet of Marine One presidential transport helos is set to receive the first of what will be a fleet of 14 MV-22s, starting in 2013.
The Ospreys will likely be replacing the unit’s VH-43D Sea Stallions which are sometimes used to transport the president’s gear and perform other utility duties for the squadron. The aging VH-53Ds are being pulled out of presidential support duty to return to normal cargo hauling missions until the Corps’ thinning fleet of Sea Stallions is retired in the coming years, said Col. Roger Pridgen, NAVAIR’s H-53 program manager earlier this week.
You can read more about the proposals for replacement of the HMX-1 aircraft assets at this link.