Hi,
I'm not sure if they still do it, but in the Airforce, there used to be a thing called 'local service' which meant that women could be stationed close to their home.
You should be aware though that joining the armed forces means that if necessary, you will be required to go to war even if it is not in your local area.
If you still want to join the army and keep your own place, - rent it out - you get an extra income on top of your wages and the mortgage will be paid too.
The forces are a great option for the gutsy and adventurous, but not a good idea if you are boring, in a rut and happy there.