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It’s been a week since the Trump White House slapped Canada with steel and aluminum tariffs on the ground that reliance on our imports was threatening the “national security” of the United States.

If Canadians are particularly galled at this, it might be because no foreign country in modern times has done more to arm and equip the United States than Canada. “I would not be surprised if every single major aircraft or warship in U.S. military service today has Canadian components in it,” said Richard Shimooka, a senior fellow at the Macdonald-Laurier Institute.

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Below, a cursory summary of some of the Canadian stuff used by history’s most powerful military.

Landing gear

We’ll start with an entry that directly concerns steel and aluminum. Quebec-based Héroux-Devtek is the world’s third largest aircraft landing gear company, and some of that is thanks to a longstanding relationship with the U.S. Air Force and U.S. Navy. Specifically, Héroux-Devtek is in charge of landing gear repair and overhaul for several large U.S. aircraft, including the heavy-lift C-130 Hercules. Of course, landing gear is made almost entirely of steel or aluminum. So, thanks to these new tariffs, American military procurers are either going to start getting hosed on their Héroux-Devtek contracts — or they’re going to have start getting their landing gear overhauls from a U.S. company that isn’t their first choice.