On August 1 , 1994 , Rivera was promoted to the rank of brigadier general .
On August 1 , 1994 , Rivera was named commander of the 81st Medical Group at Keesler Air Force Base , Mississippi .
On August 1 , 1994 , Rivera was promoted to the rank of brigadier general and named commander of the 81st Medical Group at Keesler Air Force Base , Mississippi .