"What I don't understand is why someone would be posted somewhere for 6 months and then have to move again. Is the job they were doing at an end? If so, there must be a lot of short-term, one-off tasks involved in military work: seems unlikely. Is it that they are changing their day-to-day job to take a different role? If so, why not move them to do that job at their current location? Surely there must be a range of jobs available at each base so that you wouldn't always have to move location to do something new. It just seems like a lot of soldiers are being moved for the sake of being moved, because it's the done thing."
There aren't a lot of short-term jobs in the Army. The six month tours mentioned are usually operational (Iraq, Kosovo, Afghanistan etc). The normal duration of a posting is two years but it is not uncommon to get moved earlier because of promotion or because another job has come up elsewhere and the Army has decided that you are the one to do it!
To give you a breakdown of a typical career, here's where we've been and for how long:
1st posting - my husband's YO's course. we were there for eight months (five months of the course but I'd moved in three mobth's earler as he was still in Kosovo).
2nd posting - lasted a little over a year. We were given our notice to move, had our address and then it all changed two week's before we had to move and we were sent to another location. My husband was there for a year and then he was informed that they were moving him early to he could be Adjutant of the London-based battalion. We were due to move/start in the January but we were held there for three months longer as he was posted as part of the implementation force in Kabul.
3rd posting - (again short-toured) lasted eighteen months. We were moved because the Army wanted my husband to be an instructor at RMAS.
4th - this posting at RMAS actually lasted a full two years.
5th - nine months - my husband was moved on promotion to do a course at Shrivenham. We had to move with him because there weren't enough quarters at RMAS to allow us to stay on.
6th - three months. My husband was pulled out of that job to move to Scotland to fill a post that became vacant at short notice.
Att his point, we bought our own house (I'm from near Glasgow) and we've remained here since.
7th - the job in Glasgow only lasted a year as my husband was pulled early to go to company command. Luckily, it was in Edinburgh so we could stay in our own home.
8th - comapny command lasted eighteen months and then he was sent to Afghanistan for six months at the end of it.
9th - he's currently in a post in London that (nominally) is supposed to be for two years but I'm not holding my breath as we've only ever had one posting that's lasted as long as it was supposed to!
Plenty of our friends have experienced similar moves, so we're not that unusual.
Regarding doing a different role at the same location, well the easy answer is that for some parts of the Army the different types of jobs are grouped together. So, you have a group of people working together at job A at location A and the people doing job B are at location B etc. Certainly this is the case for my husband's cap badge - they're spread to the four winds and serve as bolt-ons to larger establishments. If you want to gain a broad spectrum of experience across a cap badge, then you have to move around.
He couldn't have stayed in Scotland after his tour in Edinburgh because there were simply no other jobs for his specialism at his rank.
There are a range of jobs at any base but often it's not possible for a soldier to switch between them. On a typical Army barracks, there will be a regiment plus the support elements (logisitics, medics etc). It's simply not possible for an infantry soldier or officer to do a tour within his battalion and then stay at the location and work with the medics/logistics etc - they lack the training.
There are moves to build and develop "super garrisons" where you can have several infantry battalions and their support located around a central area (Salisbury Plain is going to be one), thus allowing soldiers to remain in an area for more than two years at a time and providing more stability. This was first announced about six years ago and is still in development.
There are problems with acquiring the housing needed and the land to build these new garrisons as well as the logisitcs of closing up other bases and moving everyone together. This is a step in the right direction but, especially for officers and for those in a non-infantry role, there will still be a high volume of disturbance.
For those who say a woman should "align herself" - that sounds really confrontational. Not that the poster is being confrontational but that language suggests that a woman has to pick a side and be on it, opposing her husband - surely not a good recipe for any marriage!
Far better is for the parents to decide together what to do - whether that be moving the children, weekly/fortnightly commuting, or boarding school. We're doing the fortnightly commute right now and it's really hard to make it work. My husband is missing out on a lot. When he went to Afganistan, our youngest was only nine months old. He's hardly seen him since then. He missed a lot of firsts and, although he makes a great deal of effort when he is home, it's no substitue for him being home every night and every weekend. I'm pregnant again and it's hard work being a de facto single parent, knowing that I won't get a break unless my Mum can help out (which she does - a great deal). So, I can understand those who don't choose to do this - it's difficult to sustain a marriage when one of you is far away but it is possible. I know some people who've sustained it for many years, so it is possible to make it work.
As I've said before, our hope is that we'll avoid boarding school before secondary age. Right now, I'm planning on remaining in Scotland until my husband finishes his current job. We've had a strong indication from the Army of their plans for him, so we're making tentative plans based on that. We're planning to move back into quarters in three years or so and then look about for a house of our own (probably near Salisbury) that will see us through the next few years. Beyond that, who knows? If we're lucky, we'll move infrequently and our boys will be able to get continuity of education without sending them away. However, my husband still has 19 years left of service so who knows what will happen in that period!
We really want to be near Army patches and Army life because, as luciemule said above, patch life can be really friendly and close - certainly compared to civvie street. Despite living in a small cul-de-sac, I barely know my neighbours!