first of all thanks for your service!! and about the bow its because you torqued the bow enough when u let it down to roll the string off the cam. If you have to let it down do it as slow as possible and try not to torque the bow and it shouldnt come off. Ive seen 2 different people do that on a new hoyt this week and have had probably 10 other bows come in cause the string jumped the cam and needed to be put back on. Its not just the destroyer it can happen to any bow.