More details on the reserve call up:

Seems that based on my sources in North Carolina they confirmed that 450 IRR reserves are all being called up from the CBRN Field. Namely the Chemical Biological Radiological Nuclear MOSes. The past 20 years, there was a significant degradation in those particular jobs, so they got to ‘dip deep into the well’ to find trained personal that can perform those duties. It takes 2-3 years to train new personal, so they are bringing back formerly trained soldiers