Samantha Carter

Earned a Ph.D. in Astrophysics with extensive knowledge in quantum mechanics
Joined the U.S. Air Force Academy, assigned to work on the Stargate Program
1997: Assigned to Stargate Command, joined SG-1
Temporarily taken over by a Tok'ra symbiote, duplicated by the Replicators
2004: Became team leader of SG-1
2007: Assigned as the commander of the Atlantis expedition, reassigned 1 year later
2008: Given commanded the Daedalus-class ship, George Hammond
2011: Given command of Stargate Command