Union officials representing police, firefighters and school system employees in Prince George’s County said they deserve a pay raise, especially if the American Federation of State, County and Municipal Employees is able to get a 2 percent cost-of-living wage increase for its county employees. “I cannot recall where one group’s gotten a pay raise and others have not, or at least some sort of equivalent,” said Andrew Pantelis, the president of the Local 1619 union that represents more than 1,300 firefighters and emergency medical service technicians in the county.