U.S. and Canadian military services are experiencing a significant shift in MRO spending. The return of aircraft from combat areas will reduce general demand and may change the levels of organic support services. The replacement of legacy aircraft with smaller fleets of new aircraft will result in reduced need for contracted services. Frost & Sullivan's aerospace and defense group found that spending for North American military MRO exceeded $35.1 billion in 2011, and is expected to decline after 2013. Spending will become more selective and specialized at that point.