Two retired U.S. military generals and a retired senior official of the Department of Homeland Security have joined private-sector enterprises.

Retired Marine Corps Gen. James N. Mattis, former head of the U.S. Central Command, was elected to the board of directors of General Dynamics while retired Air Force Brig. Gen. Charles W. Collier was elected to the board of directors of the Spectrum Group.

James M. Chaparro, the former DHS deputy undersecretary and assistant director of intelligence of U.S. Immigration and Customs Enforcement, joined Strategic Enterprise Solutions Inc. as executive vice president of strategy.