Between Jun. 29 and Jul. 1, the Air Force Nuclear Weapons center tested a (dummy) B61 nuke weapon on the Nevada Test and Training Range to the northwest of Las Vegas.
It was the first development flight test of the B61-12, the latest update to the nuclear gravity bomb that has been used since the 1960s.
The video below shows preparation and drop of the bomb from an F-15E Strike Eagle out of Nellis Air Force Base. Pretty interesting to see is the release of the nuke, with the spin rockets activating shortly after separation for free fall weapon stabilization.