A bit off subject but I find the whole trailing around thing ridiculous in this day and age. We're beyond the days of whole regiments being wiped out so I dont know why its not all done locally.
It's a bit difficult commuting between Brussels and Cornwall, or Oman and Cornwall, or Naples and Devon, so some wives do decide to move. I stayed in and around dh's base port area in our home for 20 years until he got a second foreign on the trot,. At that point, I moved. Staying in one place meant I had a job, but it did mean years of weekending, as the RN does its business in different places, from Teddington to Northwood to the US, to Shrivenham, in dh's case...none of which are remotely near Devonport. Had he taken an extension, it could have been Faslane, or MOD, and London tends to be unaccompanied. It meant ds was educated in one place til he was 10, then we moved abroad, and he went to an international school.
My db went to boarding school, but I was educated in one town for 7 years, whilst Dad was at sea, or my folks weekended.
OP, the salary depends on the rank. Housing post services can be organised from early on. Both my parents and dh's (we are both Naval kids) owned their own houses, so we always had somewhere to come back to, and d had his own place before we met. Db does as well (still serving). Whilst we may move and live in MQs, our houses are there for retirement or when you get an unexpected hiatus back in the UK between foreign postings.
Military does not only mean the Army. iirc, but the Royal Navy and the RAF as well.
Military wife is a useful shorthand in some places, especially international HQs where you will have a mix of serving military personnel, international staff (often ex military personnel), VNCs, etc. It does tend to be military spouse where we are atm though, as lots of the international military personnel are female, and bring their husbands.