Announced by President-Elect Trump during a speech December 1 (subject to waiver from Congress on the requirement to be retired for more than 7 years before appointment - expected to be forthcoming):
James N "Mad Dog" Mattis, General USMC (Retired)
Former commands:
US Central Command
US Joint Forces Command
NATO SAC(T)
1 MEF
https://en.wikipedia.org/wiki/James_Mattis
The F-35B program should survive then !