GSA = General Services Administration = Primary Contracting Administrators of the government.
FBI = Federal Bureau of Investigation
DOJ = Department of Justice
MOU = Memorandum of Understanding
The transition bureaucrats were trying to force Trump to agree to their terms. Trump said no. He finally agreed to a limited scope of authority for the bureaucrats to help. That is what is referred to as the MOU.
The limits of which the bureaucrats will ignore to no consequence. The Civil Service Act needs to go, especially at the top six levels of adminstrative agencies.
As a first action, I hope he documents all the BS and delivers that data to Congress as the situation develops. Let the likes of Collins, McConnell, and Murkowski try to defend bureaucrats getting in the way of national defense, publically, now.