In a quick aside before I get busted for straying...the USMC should have bought Blackhawks, they would be flying right now off the amphibs alongside new Navalized versions of Blackhawks that provide SAR. The UH-1Y program is an expensive disastor that comes from the marines' insular culture. They refused to buy something the Army uses and naively believed it would be cheaper to rebuild existing airframes - not only a false assumption, but technically problematic - all Y's will now be new build aircraft. The Y's will be more expensive, less capable and harder to maintain than Blackhawks and will not be in service for years yet after a tortured, overcost development program. The better question for you to ask is why no one else is rushing to buy Y's? Because every other new aircraft in the same class, including the 139, is far superior and more economical.