No autonomous vehicle made by the US has attack / strike capabilities yet. The J-UCAS / J-UCAV was proposed and demo vehicles were made, but they are not even close to operational. I would imagine the blackhawk will be a similar situation where it starts out as a transport vehicle for the foreseeable future.
Tomahawk cruise missiles are autonomous vehicles, as are stand-off anti-tank weapons that loiter on parachutes after deployment and choose their own target tanks.
Israel have built an anti-radar missile that has cruise capability, allowing it to loiter above a theatre waiting for something to make an active radar lock. I think (but am not sure) that it can even land safely for reuse after a set time frame if unused.
