It's not an unreasonable position, or lacking in common sense, to insist that any new drug, particularly one using new technology that has not been used before, have more than one year of testing before it is made mandatory, regardless of the assurances of scientists.

Furthermore, entering the military requires accepting a predefined list of vaccines and that is understood when entering - but adding new vaccines requires following the USC Code, which if you read, I can fully understand why some would feel very uncomfortable with it, and may feel that their protections against being "guinea pigs" have been ran around, as the USC Code would imply that this should not have happened so easily.

https://www.govinfo.gov/content/pkg/USCODE-2020-title10/html...