Who's on first?

Retired Adm. Thomas Collins has joined the board of directors of Spadac Inc., of McLean, Va.Bruce Crandall joined Arrowhead Global Solutions Inc., of Fairfax, Va., as senior vice president of business development. Crandall had been manager of program development for intelligence systems operations at TRW Corp. and Northrop Grumman Corp.'s mission systems unit.Rick Randall has been hired as senior director of national intelligence by SI International Inc., of Reston, Va. Previously, he was the director of systems integrataors at Juniper Networks, based in Herndon, Va.Kenneth Reisig was named vice president of vendor and distribution channel relations at Commerce Data Systems, of Bethesda, Md. He comes to CDS from All Points Logistics Inc., of Gainesville, Ga.Ramkumar Valliyur has been named director of engineering services at Avineon Inc., of Alexandria, Va. Previously, he was vice president of engineering for National Filtration Systems, a division of Clark Reliance, of Strongsville, Ohio.Roger Waldron has joined Mayer Brown Rowe and Maw LLP in the law firm's government contracts practice in Washington. Previously, Waldron was acting senior procurement executive at the General Services Administration.David Watkins has been hired as managing director of MorganFranklin Corp.'s Chicago practice. He'll oversee client services for the McLean, Va.-based company. Previously, he was chief operating officer of European operations at Maritz Inc., of Fenton, Mo.Guy Wilkerson has been named vice president of business development at Robbins-Gioia LLC. He comes to the Alexandria, Va., company from Sun Microsystems Inc.At the Aerospace Corp., of El Segundo, Calif.: Willard D. Downs III to principal engineer in the computer engineering subdivision and Jean Michael to associate principal director in the National Polar-orbiting Operational Environmental Satellite Systems organization.At General Dynamics Corp.: Tom Kirchmaier to senior vice president and general manager of its national and defense intelligence solutions division. He had been senior vice president and general manager for the global information services division.At immixGroup Inc., of McLean, Va.: Art Richer to president. He is responsible for daily operations and profit and loss responsibilities, including the company's technology representation business, channel programs and contract management services. Jeff Copeland remains chairman and chief executive officer.At SAS Institute Inc., of Cary, N.C.: Karen Knowles to director of the SAS federal division in Arlington, Va. She previously managed the civilian sales team for SAS.Alex Lunsford as civilian sales manager at SAS. He previously handled the Agriculture Department, Social Security Administration and other key accounts.At TeleCommunication Systems Inc., of Annapolis, Md.: Michael Bristol Sr. to senior vice president of its network solutions group. He will oversee the group's overall business operations, sales and marketing, and research and development efforts. Previously, he had been vice president of the group.At Westar Aerospace and Defense Group Inc., of Huntsville, Ala.: Randal Tieszen to executive vice president of operations. He previously was Westar's executive vice president of aviation programs.At IAP Worldwide Services Inc., of Cape Canaveral, Fla.: Laura Mitchell to vice president, professional and technical services. She will be responsible for day-to-day operations and growth in the unit.At Data Systems Analysts Inc., of Fairfax, Va.: Bill Jones to vice president and general manager of the company's Washington and Midwest operations.At Avineon Inc., of Alexandria, Va.: Cary Bledsoe as director of the Midwest region at the company's Defense Systems division. Bledsoe will lead efforts to defense contracts and assist with business development in the Midwest area.At Northrop Grumman Corp.: Catherine Kuenzel to vice president of enterprise infrastructure services and solutions.