If troops can be forced to take vaccines and exercise and control their weight to stay fit for duty, then they should be required to use no/low-fail BC while on duty requiring deployments to combat zones
injection, implants or IUD’s come to mind
same penalty for refusal as for those who refuse immunizations, exercise and PT test, and weight control
discharge
There are a number of problems with those methods, especially the injections. However, its pretty easy to determine if it was a legitimate accidental pregnancy or a ploy to escape deployment.
There is no perfect birth control method short of surgery or abstinence.