Really curious if SFO is one of those "lending" personnel to the southern border. The Washington Post ran an article a few days ago about resources being moved from the northern border. Haven't seen anything yet addressing SFO or any other Northern CA airport.
U.S. Customs and Border Protection says 731 northern border agents from land, sea and airports are in the process of being sent to the U.S.-Mexico border, where they will help their southern counterparts handle the influx of families and unaccompanied children from Central America.
...and this:
While CBP wouldn’t specify where the agents are coming from, they are being drawn from 328 ports of entry.
US-Canada border transfers raise fear of delayed crossings