One of the reasons the US Army put keys in there Helos is not against theft but crews accidently taking the wrong Helo!! If you have seen the flight line at FT Rucker you would understand ,row upon row of Helos, in the past crews have left the flightline and inadvertantly got into the wrong Helo, so give the crew a key and if the power doesn't come on you may be in the wrong a/c , try again!!