helicopter pilot losses in vietnam war

https://docs.google.com/viewer?a=v&q=cache:X_xfUtIUdz0J:www.vhpa.org/heliloss.pdf+&hl=hr&gl=hr&pid=bl&srcid=ADGEESgi8ag3Hw47XDdD4AqJI6MNxrxmx4xR74LKzCbgOTHo8qQC2ElHzBefltuwqR6GuzAd71HUzL2vDRP9C6UqTh3UfhNZBGkyi6H85t_Imr2vCuDsdny6bWeOYJm2vJNd8bmX4drW&sig=AHIEtbRYPpZUJmbjVF_wpn3ucwz8s5QWng

How is it possible that 2202 US helicopter pilots died during vietnam war while during the same war there were 5086 helicopters lost?

I understand that not every helicopter loss has to result in pilot death, but are we talking about losses or helicopters written off? Because such large discrepancy in numbers can best be explained, in my opinion, if most “lost” helicopters were damaged in action or simply worn out to the point where they could fly safely enough for pilots to be brougt home, but were labeled as unworthy of repair.

Actual losses in action should probably then be much closer to 2202 killed pilots, certainly under 3000 units.