So, 4 years of college (18-21), 4 years of medical school (22-26), 3 years of residency (27-29). So unless this is Doogie Howser, he's only been a real doctor for about six years. But since he's from a "Doctors for America", he's there to perform an action similar to the NKVD in the Soviet military - to shoot the deserters and maintain revolutionary fervor rather than perform actual medicine.
That just about sums it up.