Congratulations on the forthcoming nuptials!
I was going to suggest you take a peek at GBAP for a Tongue in cheek look at what jobs are "appropriate" for Officers' Wives. Actually, though the book does have its moments, the other posters are right about the trailing spouse's lives being rank blind.
I held down a serious office-based job for many years - it's meant a lot of separations. If you want/have a career, that's a scenario to think about; you'll find many doing the same thing.
If you want to be portable, then look at options for being free-lance (often only works if you're established in a field, or are prepared for very irregular work). You need to think about whether you want an income, or a useful occupation too.
Things like illustration (if you have a talent) travel very well, as might anything web-based. Crafty things like jewellery-making and dress making do so too. As does selling services (including on the patch), like pilates instructor, child-minder, catering, cake-decorating.
Nursing and teaching are good, because you might find opportunities in the voluntary sector when overseas, and ESOL teaching can work very well.
Do not however become a sex-line operative - that coukd be just a teensy bit difficult for DH if anyone recognised your voice!
More seriously, do not overlook volunteering for organisations like SSAFA - it keeps your CV going, and gives skills that are very useful for transferring to elsewhere in the sector at other times. If you get the chance to learn Nepalese, then there are whole rafts of Gurkha welfare roles who would welcome you.