If ‘we’ are short masks, why are ‘we’ selling them at auction?:
https://gsaauctions.gov/gsaauctions/aucdsclnk?sl=71QSCI20292041
Wow That GSA auction mask is rated pm2.5 so is good for smoke and haze, too, IIRC.
The military puts a date on everything and gets rid of it after that. It’s for safety reasons and maybe also to line the pockets of someone in fedgov most likely. That 3M 8120 model is listed on 3M’s coronavirus page too as being a decent one for us peons. Those might be the only ones left in the country.