Over the past four years, employees have left DHS at a rate nearly twice as fast as in the federal government overall, and the trend is accelerating, according to a review of a federal database.

The departures are a result of what employees widely describe as a dysfunctional work environment, abysmal morale, and the lure of private security companies paying top dollar that have proliferated in Washington since the Sept. 11, 2001, attacks.

The department's terrorism intelligence arm, for example, has cycled through six directors during the Obama administration, decimating morale and contributing to months-long delays in releasing intelligence reports, according to interviews and government reports.