Yes - keep them in the sleeve if you got one - not all military outlets give a little sleeve. If you put them in a leather wallet without protection, or near a credit card, they can SOMETIMES lose their uumph (I guess the static and/or the mag strip on the credit card demagnatizes the strip on the ticket.) BUT - not to worry, the guest services people can take care of them for you if they do
And those paper tickets are pretty durable.
Even my new Annual Pass is made of paper.
Maddle
PS - be sure to photo copy them, or at least write down the code numbers on them, in case they get lost. The guest services people can help with that too, if they have enough information.