The summary includes some interesting tidbits for passengers looking into program benefits and drawbacks — e.g., only Delta and JetBlue don't let miles expire due to account inactivity; only United, Alaska and Frontier have blackout dates for mileage - purchased tickets; and all but Southwest impose a fat mileage redeposit fee for backing out of a booked award ticket. (travelskills.com)
I have not found an airline that has a written policy for no change, cancellation, or mileage redeposit fees for military. (rewardexpert.com)
However, insurers will reimburse you for the change and / or redeposit fee if you must adjust or cancel a trip booked with award tickets. (rewardexpert.com)