23 years ago - 60-year-old Sandra Knight helps take apart Argus and founds Checkmate & becoming it's head of tactical. She reunites with 72-year-old Iron Munro when he consults with Checkmate. 24-year-old Amanda Waller becomes a checkmate operative.
17 years ago - 22-year-old Katarina Archer becomes a Checkmate agent, & takes the Spy-Smasher identity as her callsign.
14 years ago - 33-year-old Amanda Waller forces 69-year-old Sandra Knight into retirement and takes over as tactical head of Checkmate. She recruits 27-year-old Rick Flagg as her primary operative, and begins a new government operated Freedom Fighters. 22-year-old Katarina Archer is their Checkmate liaison. 22-year-old Manchester Black uses the shake-up in Checkmate's hierarchy to manufacture his own release from Checkmate, becomes a black-ops British intelligence operative.
13 years ago - 34-year-old Amanda Waller consolidates much of the DEO's tactical responsibility into Checkmate, leaving the DEO primarily responsible for extranormal affairs.
12 years ago - 35-year-old Amanda Waller takes 31-year-old Buddy Blank from observation in the DEO into Checkmate so he can join the Freedom Fighters.
7 years ago - 32-year-old Katarina Archer is revealed as a double agent. She loses her Checkmate clearance. 29-year-old Thomas Tresser brings down S.H.A.D.E., and turns himself in to Checkmate.
6 years ago - 41-year-old Amanda Waller loses control of Checkmate in a congressional oversight hearing orchestrated by 77-year-old Sandra Knight over the Quarac Bombing with the help of 89-year-old Iron Munro. Her position is taken by 34-year-old Bones, who reorganizes the Freedom Fighters. He names 30-year-old Thomas Tresser as the teams agency liaison.
5 years ago - 35-year-old Bones is given control of the DEO. He releases control of Checkmate to the United Nations, moving the Freedom Fighters into the DEO. The UN creates the new Global Guardians under Checkmate.