Find out if it's needed. Many states won't charge for rescue; I have no idea if Alaska is one of those. Do note that if there may be helicopter charges ($$$$) even if no other charges. It really depends on the state, and whether the helicopter is private or DOD/National Guard (the latter chalk it up to practice time)! Some health insurances (mine is one) will pay if it's a helicopter ambulance, but not otherwise.

I do recommend donating to the local volunteer rescue organization wherever you go. These folk risk life and limb and spend long hours getting us out of trouble!

On the other hand, $18 is really cheap! Find out how much it actually covers!