Welcome, FI Military!
You're good to go, but let me help you polish the cannonball.
Right now you're bringing in $7500/month and saving over a third of it... and it looks like you're planning to save most of your promotion pay raise, too.
Your pension calculation looks good, and at that point you'd be spending your income. If you withdrew from your $461K assets (which will probably be larger in 2019) at a 4% SWR then you'd be able to take out at about $18K/year. No problems there, either, but when you're overseas I don't think you're going to need to withdraw anything.
You seem to be comfortable with your asset allocation (whatever funds those USAA & Vanguard tickers may represent) and I think you've done more than enough for your kids' college fund.
Your travel plans will probably cost much less than your current spending, unless your Asia itinerary means Hong Kong instead of Bangkok. When you retire you'll also have more than enough time to scrub your expenses and figure out what's important to you. You'll also save quite a bit by not having to insure those oversized vehicles. Instead of ramping up your spending while you're overseas, you could probably continue saving for your house fund.
It looks like you've turned down your spouse's Survivor Benefits Program, and that makes sense. Since she has plenty of her own annuitized income (with a COLA) I think she could afford to turn down yours too. You'd keep the [6.5% of your pension x 30 years] premiums that you'd be spending on excess insurance. (More savings for the house.) If your kids had health problems or other special needs then you could direct your SBP to a special-needs trust for their benefit. If it would help your spouse sleep more soundly at night then you could do a term policy until age 60, but she might have all the family expenses covered between her pension and your assets.
If you leave the country as soon as you retire then you'll probably get your health insurance through Tricare Overseas (
http://www.tricare.mil/Costs/HealthPlanCosts/TSO.aspx), but that's really only for the catastrophic cap of $3000/year. I think you'll pay out of pocket for your medical/dental costs, never submit a claim, and still be way ahead of what you'd pay in America. I know that's the case in Bangkok and you'd probably see similar pricing in Latin America.
It would be much more convenient for you to enter retirement with a fully-developed VA disability claim. Ideally they'd just have to review your package and not conduct additional exams. If you can submit the VA claim before you leave the country then you won't have to deal with them trying to get you to an appointment in the U.S. while you're thousands of miles away. If your spouse has not yet submitted her VA disability claim then she has three years to get it into the system.
Another reason to submit a VA disability claim before you retire is for the waiver on the funding fee of a VA loan. (See page 8-17 of
http://www.benefits.va.gov/WARMS/docs/admin26/handbook/ChapterLendersHanbookChapter8.pdf) When you return to the U.S. after your years abroad then you could obtain a VA mortgage as part of your home plans. Of course if your spouse already has a VA disability rating then you're set. And regardless of your VA loan eligibility, it's still worth using a mortgage broker to compare various other programs and costs. A 20% down payment and a mortgage with a credit union might beat the VA loan's interest rates.
My point about a mortgage is that you have dual military pensions. You don't have to dump a lot of cash into a house. No matter what happens to the stock markets (or real estate), your annuitized income will cover your mortgage payment. You can afford to take out a 30-year mortgage with fixed payments, because just about every year your pension will have a COLA of 1%-2%. That will leave the rest of your assets to grow for the long term instead of tying up a large portion of your net worth in your house. The question should be "how much" mortgage, not "if".
All of those suggestions are just tinkering at the margins, because now I'm going to share a dirty little secret of dual-income couples with two pensions: you'll probably have more money than you need. Unless you indulge in yachts, Cessnas, and Teslas then you'll probably have a lot more than you need. All those years of juggling careers and parenting are paying off.
Enjoy the travel! You might want to do more than a couple of years, but that depends on where you school the kids. For example there's Jed of Bucking-The-Trend.com in Granada for a second year, and you could easily do the same for your kids with the right visas. If you're not in one place for an entire school season then homeschooling is always an option.