Several officials emphasize that the details are still being worked out and may change before final approval for the deployment is given by Defense Secretary Lloyd Austin.
Since taking office, President Joe Biden has said his goal is to have up to 1.5 million Americans vaccinated every day. The current average is 1.2 million a day since he took office, so if the deal is implemented successfully, it can help to overcome his goal.
The preliminary plan calls for an incremental increase in forces that would quickly lead to 50 vaccination teams, each capable of delivering 6,000 vaccines per day, and another 50 teams capable of delivering 3,000 vaccines per day.
Vaccination operations at the 100 designated sites would last 16 hours a day, with two eight-hour shifts. Once the deal is finalized, troops will be ordered to be prepared to deploy in 96 hours.
The draft agreement also states that FEMA could issue additional orders to increase the effort with more personnel under the Pentagon agreement.
Under the proposal, the Pentagon would also provide communications and command and control elements for planning and coordination between site locations. FEMA will be responsible for providing personal protective equipment, site security, traffic control and supplies and equipment to manage the sites.
Several officials told CNN that a final settlement is expected soon, but it is unclear when this will happen.
This story is emerging and will be updated.