I've actually already got the Rumanian and Hungarian HQs working as supply links in France, because they're not much real use elsewhere, and why waste a good German HQ (or semi-good Italian one)?ORIGINAL: composer99
SS MIL, GARR and maybe the 6-3 SS INF from 1939 are decent garrison units. Regular GARR and MIL are also good
Right now, given the small CW army you don't need a strong anti-invasion defence. Just cover up the cities on the coast and key ports. Italian and Rumanian HQs are good for maintaining supply in Western Europe outside the range of the capital cities.
MTN units are actually better off used for winter operations in USSR where they are winterized.
Edit: Also, garrisons against invasion do double-duty against partisans.
More Edit: Also, because you want to defend against port attacks on surface fleets in France & Portugal, you will want to base FTR to defend any of Brest, Bordeaux, Gibraltar or Lisbon that you have surface fleets based in. These also contribute to anti-partisan garrison while organized.
I already have FTR based in Brest and have some to rebase from the Gibraltar area to Lisbon, so that works.
What I was most interested in was if I should use the MIL units or other INF types, since MIL can be rebuilt quickly. Thanks for answering that question for me.