I think that it a number of things that your dealing with here. Your husband is in the military and your based near an army camp. You have a 3 year old and a 10 month old. Meanwhile he was away from last March to Oct then he went away again last Nov and won't be back for another 2 month's.
Your dealing with a 3 year old and a 10 month old on your own. You gave up your job because you don't know where your husband will end up. You not near family so you don't have their support.
Do you have any friends where you are? Do you know anyone that could mind the kids and give you a break to do something you like? Even if you did a night class once a week and met some people it would give you some child free time.
Will your husband always be expected to travel in his role? Has he done any extra courses ect that would help get work outside the army? I know when you join the army you agree to stay there for x number of year's - when can your husband leave the army? Can he buy himself out of the army?
I knew a man who was in the army. He decided to do a degree when he was their and the army paid for it. Like your husband he was going away for 6 months at a time. He realised that long term this was not going to work for family life. He decided that once he was allowed to leave he was going to do so. He had a degree and good experience so he started to apply for jobs coming up to the period of when he was allowed to leave. He got a job and handed in his notice then.
I think in your circumstances that I would try to see if you could get your children minded and see if they are any jobs locally even part time to give you an outlet and keep up your national insurance contributions.
I would also be prepared to have a proper chat with your husband about his long term plans and when can he leave the army. If he can learn certain skills, do a trade or degree when he is their it can give him options when he leaves.
He can't expect you to have the children full time on your own for 6/8 months of the year or for you to stay unemployed for his army career. He needs to make a plan with you and sort things out so long term it's better for you all.
I know couples who put in the long hours in jobs, did traveling, had long distance relationships, did degrees when working ect but it was a few years of hard work that were going to pay off long term for them and their families. Their was a plan in place and a light at the end of the tunnel.
It was not one person expecting the other person and their kids to work around what suited them.
If he is not willing to leave the army I would see could you move home, get a job and stay with parents until you get a place to live. If you had some family support I think it would help you to move forward.