This is what it’s like for troops serving at a mass vaccination site March 1 Army Spc. Jeb Hoover vaccinates a community member at the walk-up vaccination site at California State University, Los Angeles in California, Feb. 20, 2021. (Pfc. Garrison Waites/Army) LOS ANGELES ― Hundreds of active-duty and National Guard troops are strapped in for what could be a long ride at Los Angeles’s mass COVID-19 vaccination center, giving up to 6,000 doses a day. “They told me I could be here until September, so we’ll see,” said Senior Airman Samantha Campos, an unmanned aerial vehicle crew chief, who staffs a drive-up vaccine lane.