None of those that come to mind have anything to do with support of the currency, so far as I can tell. You will have to be substantially more specific.

Lybia, Iran and Iraq. This topic comes up every day, and every day someone who doesn't know history will show "skepticism". I don't have a copy/pasteable text in hand, and I'm not gonna write one from scratch. Just learn some history please, for the sake of mankind.

Please explain how any of those were actions taken in support of a strong dollar, as opposed to in support of particular economic interests otherwise.

Petrodollar. Denominating oil prices in other currencies would cause oil producing countries to stop importing dollars (accepting payments in dollars), which would cause all those dollars to return back to the US and cause a hyperinflation. Furthermore, as if that wasn't bad enough, the Fed wouldn't be able to print dollars at the rate they currently do (the money would have nowhere to go), which would cause the country to default because the government wouldn't be able to repay its obligations.

The war in Iraq and the coup in Libya were done purely out of economic self-preservation, and not because a few savages with AK47s would pose a serious threat to the western world.