Your time together is often short and often highly emotional/sexually charged.Luke is correct in his advice,also whilst he doesnt want to sound crude i will say that while having sex dont just moan your pleasure say it such oh god yes i like that, or please baby more when he really gets you going timing is necessary but you will know when to say it, at the end tell him your sorry but you just cant get enough of his body and how he feels inside you,what his hands feel like tell him you have never wanted a guy so bad as you want him.That when he makes love to you this is constantly in your mind when he's away in deployment,and this is what you think about to see you through his time away,also the feel of his hand in yours the little things his kisses the taste of his lips.
Write him sensual letters reminding him of your sex sessions telling him how you loved it when his lips touched you in places be explicit but not tacky with it.Tell him how he makes you squirm for more when he's thrusting inside you.We all have the ability to say these things and guys love it but only be truthful dont lie, be noisier in sex talk not a whole conversation but that oh god yes please kind of way.
We know what men feel and how they like to make women into howlers when having sex if you are too laid back and dont seem responsive in actions he wont believe your words.
A mistake is always forgivable, rarely excusable and always unacceptable.
Robert Fripp