Acting Pentagon Comptroller Elaine McCusker, who raised concerns in 2019 about the legality of the U.S. freezing aid to Ukraine, has resigned.

The Pentagon is defining details of what the first block of a Defense Department-wide architecture for space-based missile warning systems would look like and will present the plan to the Joint Requirements Oversight Council.

Operation Warp Speed aims to deliver 300 million doses of a vaccine to inoculate the spread of the novel coronavirus by January, but senior Trump administration officials acknowledge that they cannot guarantee a 100% success rate.