Michael Penta has joined Giga-tronics Incorporated, San Ramon, California, as vice president of sales.
Thomas Hobika has joined EarthLink Incorporated, Rochester, New York, as vice president of the company's IT Solution Consultants organization.
Deven Kalra has joined AtHoc Incorporated, San Mateo, California, as vice president of Engineering.
Northrop Grumman Corporation, Falls Church, Virginia, has selected Karen A. Williams vice president, contracts, pricing and supply chain.
MBDA Deutschland GmbH, Schrobenhausen, Germany, has named Thomas Homberg managing director and executive group director, Improvement.
Rear Adm. Jeffery R. Penfield, USN, has been nominated for assignment as commander, Operational Test and Evaluation Force, Norfolk, Virginia.
Engineering Services Network Incorporated, Arlington, Virginia, has named Kathleen Casey executive director of Veterans Affairs.
Capt. Lawrence E. Creevy, USN, has been selected for the rank of rear admiral and assigned commander, Naval Surface Warfare Center, Washington Navy Yard, Washington, D.C.
Dustin Kramer has been appointed president of Eurotech subsidiary Parvus Corporation, Salt Lake City, Utah.
Maj. Gen. David R. Hogg, USA, has been nominated for appointment to the rank of lieutenant general and assignment as U.S. military representative to the NATO Military Committee, Belgium.
Michael J. Millward has joined TWD and Associates Incorporated, Arlington, Virginia, as director, Special Projects Business Sector.
Dr. Arati Prabhakar has been named director of the Defense Advanced Research Projects Agency, Arlington, Virginia.
Rear Adm. David A. Dunaway, USN, has been nominated for appointment to the rank of vice admiral and assignment as commander, Naval Air Systems Command, Patuxent River, Maryland.
AMERICAN SYSTEMS, Chantilly, Virginia, has appointed Kristen Murphy vice president, Capture Management.
Vice Adm. John M. Richardson, USN, has been nominated for appointment to the rank of admiral and assignment as director, Naval Nuclear Propulsion Program, Department of the Navy/Department of Energy, Washington, D.C.
Lockheed Martin, Bethesda, Maryland, has appointed Rick Ambrose vice president and deputy, Space Systems Company, and Tim Reardon has been named head of the company's Information Systems and Global Solutions.
STG Incorporated, Reston, Virginia, has hired Steven Bouchard as vice president, Integrated Capture Management Services.