Grennie, I am in the forces and have deployed a few times - the longest being 4 months away but a few times up to 2 months.
I had no option (at the time I had my boys) to take longer than 4 months maternity with the eldest, 6 months with the youngest. I had no option to reduce my hours to part time, or even to not work shifts. (I could have left obviously, but I couldn't have continued with that career again without re-joining and starting from the bottom again).
My husband is also serving, and what you just posted is absolutely spot on - nobody bats an eyelid when he goes away and I am left, but there are always comments when I have to do anything. Even down to the ridiculous "Ooh, hasn't Mr Lewinski done well looking after the children whilst Monica is away; fair play, he's kept on top of the housework too".
It has improved in some way for mothers in the forces over the last few years (up until the early 90s you were sacked for being pregnant, so it is still a very misogynistic environment), but we are still judged differently to the fathers and held to a higher standard of implied guilt.
I hate seeing mothers attack each other on here, I firmly believe that we all try to do our best for our children and families - just because someone has made a different choice as to how to do something (SAH/WOH) it does not mean they are wrong, or that they are by default de-valuing/sneering at a different choice.
All a bit rambly, sorry!