In September 2019, he was promoted to Assistant Adjutant General of Oklahoma. On November 10, 2021, Governor Kevin Stitt appointed him Adjutant General of Oklahoma.[1] Citing his constitutional duty to follow a governor's order, Mancino quickly issued an order on behalf of Governor Stitt, rescinding a COVID-19 vaccine requirement for members of the Oklahoma National Guard.[2][3] At the time, the order violated The Pentagon's policy on vaccination.[4] The James M. Inhofe National Defense Authorization Act for Fiscal Year 2023 required the police be rescinded in Januaru 2023.[5] After Texas sued to prevent the enforcement of the federal vaccination policy for national guardsmen, the 5th Circuit Court of Appeals issued an injunction preventing it's enforcement. [6][7]