Melinda May

Joined S.H.I.E.L.D., as a pilot & soldier, gaining years of experience
Withdrew from field duty after an incident in Manama, which left her mentally damaged
Returned to the field at Nick Fury’s request, helped stop John Garrett
After HYDRA’s infiltration was discovered, she helped restart S.H.I.E.L.D.
Mortally injured on a mission but was healed by Enoch;
Discovered she no longer felt emotions but could feel the emotion of those around her
Retired & became a professor at S.H.I.E.L.D.'s Coulson Academy