If you read this executive order from 9.19.19, it states that there was a task force set up in 2019 to combat a potential future pandemic and they needed new types of vaccines to be developed to treat this pandemic:
https://bit.ly/3a0ZLz5

It specifically mentions using the DODs research and development of vaccines. That’s the MILITARY, folks.

It mentions RECOMBINANT vaccination techniques.

Now read this document on the history of US Military contributions to Malaria:
https://bit.ly/3FgIzE4

“In the 1980s, U.S. Army and Navy investigators were among the first groups to use RECOMBINANT DNA methods to synthesize a recombinant protein composed of the surface coat of the infectious-stage malaria sporozoite as a human malaria VACCINE”

More to explore but this will allow us to do some digs...

To sum up, this EO by Trump gave the ability to the HHS and CDC based on what the Military had found success with in the past to create a new type of vaccine.