T-Minus Military Duty Countdown Cost: $9 Get the full version     Trial version     Developer's Website Contacting third-party download site please wait. If your download does not start, click here, or get the full version Descriptions T-Minus Military Duty Countdown: Military Duty Countdown. Whether you are preparing for a military assignment, awaiting leave, or finishing a tour of duty, you can count down the remaining time. Your anticipation will build as you count down the days, hours and minutes. A software program for your PC that's fun and easy to use.