Who's on first

, former 10-term, Republican representative from Pennsylvania and vice chairman of the House Armed Services and Homeland Security committees, joined Defense Solutions LLC, Exton, Pa., as the company's chief strategic officer. joined Avineon Inc., Alexandria, Va., as vice president of strategic development. Caso most recently was national security adviser and chief of staff to Rep. Curt Weldon, R-Pa. joined DRS Technologies Inc., Parsippany, N.J., as senior vice president, land warfare strategic plans and programs. Sinn in December retired from the Army as a lieutenant general and military deputy for budget to the assistant secretary of the Army. joined Calibre Inc., Alexandria, Va., as vice president, financial and cost management. Gregory recently retired as a brigadier general in the Air Force and as USAF director, budget operations and personnel. joined Global Telecom and Technology Inc., McLean, Va., as chief financial officer. Welch most recently was vice president and treasurer, Meristar Hospitality Corp. joined TechTeam Government Solutions Inc., Chantilly, Va., as vice president of its Defense Department division. Flading previously worked in homeland security technology support for General Dynamics Corp.'s IT sector. joined Government Acquisitions Inc., Cincinnati, as executive vice president. He most recently was president of Prism Point Technologies LLC. was named CIO of the Baltimore-based electronic systems sector of Northrop Grumman Corp. of Los Angeles. He was operations director, electronics systems, for the company's IT sector. joined Netcordia Inc., Annapolis, Md., as vice president of engineering. Ennis is former chief architect of Network Chemistry Inc., former U.S. Army colonel and commander of the White House Communications Agency, joined MorganFranklin Corp., McLean, Va., as a director in the technology solutions group.At VisionAir Inc., Castle Hayne, N.C.: to vice president.At Legal Files Software Inc., Springfield, Ill.: to the newly created position of sales and marketing director.At Northrop Grumman Corp., Los Angeles: to president of the company's McLean, Va.-based civilian agencies IT business.