Secretary (Lloyd) Austin has said, DoD is committed to do as much as it possibly can to assist the whole-of-government effort against COVID-19."Kirby did not specify the number of troops that would be necessary to carry out such an operation, but it is expected to be in the thousands.FILE - A member of staff uses a needle and a phial of Pfizer-BioNTech Covid-19 vaccine to prepare a dose at a vaccination health centre in Cardiff, South Wales' on Dec.