In an era when the US administration wants to reduce expenditure there are several major tactical aviation projects that could become large targets. One of those projects is the V-22 Osprey tilt-prop utility transport. Although the V-22 can fly fast and high – there are several alternatives in the form of slower and lower flying helicopters that are more flexible, rugged and less costly to procure and operate.

It is unlikely that US forces will receive anything like the 550-odd Ospreys that were envisaged a decade ago. So the V-22 – and especially the MV-22B of which the USMC was expected to receive some 450 aircraft - is " flying on tenterhooks ", or as some people prefer " flying on tenderhooks ".