I have no idea how well this would work for you (depends a lot on the nature of your duty right now), but it's melting fat off my thighs - the female version of the same problem you have (wfs) - http://www.fast-5.com/
I had no problem transitioning into it - only took me 3 days, where I just stretched the fasting period out from overnight to the full 19 hours.
And ... in my feeding window, I get to eat real meals! Full size meals!! At my height (5'1"), trying to do Zone or something of that type means I get about two bites per snack and 3 per meal. Wow - be still my heart
The point of IF is to get your body burning fat stores by not giving it other sources. It works for many people, but not everyone.
HTH - and a hat tip from a Vet to another one serving. Come home safe.