Please answer the following question: Given the following context:  Frank Moses, retired black-ops CIA agent, lives alone in Cleveland, Ohio. Lonely, Frank creates opportunities to talk to Sarah Ross, a worker at the General Services Administration's pension office in Kansas City, Missouri, by tearing up his pension checks and calling to say they haven't arrived. One night, an assassination squad raids Frank's house and attempts to kill him but he easily wipes them out. Knowing they will have tapped his phone, he believes Sarah will be targeted. In Kansas City Sarah refuses to go with him so he kidnaps her. Meanwhile CIA agent William Cooper is assigned by his boss Cynthia Wilkes (Pidgeon) to hunt down and kill Frank. To find out who is targeting him Frank tracks down his old associates for help. He goes to New Orleans, Louisiana, and visits his CIA mentor Joe Matheson, who tells him the same hit squad murdered a New York Times reporter. An agent posing as a police officer tries to abduct Sarah but Frank returns in time. Cooper chases them but Frank tricks the police into arresting Cooper and escapes with Sarah. The two head to New York City and find clues left by the reporter which lead them to a hit list. They find Marvin Boggs, another old associate and a paranoid conspiracy theorist, who tells them the people on the list, including Frank and Marvin, are connected to a secret 1981 mission in Guatemala. A pilot on the list, Gabriel Singer, tells them the mission involved extracting a person from a Guatemalan village. Singer is shot by a helicopter-borne machine-gunner and the team escapes as Cooper closes in.  answer the following question:  What is the last name of the person who tears up his pension checks?
Answer:
Moses