Michael Hammer, 42, of Potomac, Md., was an American agricultural adviser and was one of the American victims of the Salvadoran civil war. A 1964 graduate of Georgetown University's School of Foreign Service, Mr.Hammer was widely known among members of the Foreign Service. Mr. Hammer, director of the Agrarian Union Development Department of the American Institute for Free Labor Development, was killed by gunmen in San Salvador on January 3, 1981. He had worked for the institute since 1965. Also killed in the incident, which took place in a hotel dining room, were Mark Pearlman, who was recently employed by the institute, and Rodolfo Viera, president of the Peasants Workers' Union, El Salvador. The three men were working on an agrarian reform program for the rural poor.

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