January 22, 2021
On Friday, January 22, 2021, the President signed into law:
H.R. 335, which provides an exception to a restriction on appointing a Secretary of Defense who, within the past seven years, had been on active duty in a regular component of the armed forces.
Joseph R. Biden, Bill Signing: H.R. 335 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/347842