What is the helicopter in the background of this image of the V-22 Osprey?
It's an MH-53 Pave Low.  In the Air Force Special Operations Command (AFSOC), the CV-22 replaced the MH-53, although there were several years when both were in the inventory.
From the look of the beach, this photo was taken near Hurlburt Field, Florida, which is where they were both based as the first CV-22's came on-line.  Hurlburt Field is also the headquarters of AFSOC.