If you will be keeping your U.S. domestic health insurance coverage and getting Outreach for your international travel, or the Patriot international plan, preferring to buy a year at a time, the international plan.  If you visit the U.S. for more than 2 weeks out of that 12 Month travel policy period (Coming back for a quick visit to the U.S.) and not using your international travel plan in the U.S. (Using your continuing U.S. health coverage instead) your travel insurance policy would not become void.
As long as the policyholder intends to return overseas, outside the U.S., then this is not a problem. One may keep their Outreach International or Patriot International policy. Again, the key is they are going to be going back overseas during that policy period of their international travel plan that is currently effective / active.