First off, it's not "US-AID". It's "USA-ID": "US-Agency-International Development".
Also, similar to when you're talking to a Scientologist and their definition of "technology" isn't the same as yours, the "Development" here probably isn't what you're thinking. People see the "development" and think things like bridges and hospitals and shit, and it does include that, but it's focused on "capacity building" and includes anything that can extend the US sphere of influence (that's why China and Russia banned USAID).
USAID funds anything that could be used to influence a population towards a goal that the US wants, which is why it does things like give money to the BBC in addition to doing things like funding gay comics in Guatamala.
I'd be willing to bet money they're also behind those "Gender relations" binders that one guy found in Afghanistan after the US pulled out.