Rowan Tree and Red Thread

As you get to know the game better, you'll learn to pay more attention to cards that let you bypass production. For example, there are at least a couple of cards (though one might be in the expansion) that let you draw a card for settling. If you get both of those, and choose the Settle action (which you do a lot anyway in the military strategy), you're drawing three cards after settling, which is the equivalent of a brown production.

Another handy thing for military is the cards that give you card draws in Consume. You can feed them with those cheap military windfall worlds.

Also, the more players there are, the more use you get out of the cards that let you draw in various phases like Develop or Produce.