I assume these are high-level security personnel at Apple HQ. It doesn't seem unreasonable to have armed security at a place like that.
> A grand jury alleges that Thomas Moyer promised to donate 200 iPads worth $70,000 to the Santa Clara Sheriff’s Office in exchange for four concealed firearm licenses for Apple employees.
https://www.forbes.com/sites/rachelsandler/2020/11/23/apple-...