Federal agencies may have a tough time holding on to their program managers come 2017. A new Government Accountability Office report ranked program management as the occupational category with the highest percentage of employees eligible to retire by 2017. For mid-sized agencies like the General Services Administration, Housing and Urban Development Department and Office of Personnel Management, 56 percent of employees involved in program management will be eligible to retire in the next three years, the report found. At larger agencies that number is nearly 44 percent. As more employees become eligible to retire, GAO noted that occupations like program management…