Plant an Agent on H.A.M.M.E.R. Council is an Act of Infamy found in Eastern Bloc. This is a part of Objective 7 - Global Chaos.
Mission Brief[]
"The high-ranking government official gave us a series of access codes before he succumbed to the rigors of our interrogation. Send a diplomat to sweet-talk his way into the centralized H.A.M.M.E.R. records department in Yugoslavia, and use the access codes to tweak a few files and add a new position to the H.A.M.M.E.R. council. A position which will, of course, have one of our own diplomats as its first incumbant."