Dr. Bryan Creed Jack, 48, was director of the programming and fiscal economics division in the Office of Program Analysis and Evaluation in the U.S. Department of Defense. He was responsible for designing and maintaining the Future Years Defense Program and developing the fiscal guidance by which the Secretary of Defense allocates funding to the military and defense agencies.
   A former National Merit Scholar and Presidential Scholar from Texas, he graduated from the California Institute of Technology and studied in Japan as a Henry Luce Scholar. He later earned an MBA at Stanford University and a doctorate in economics from the University of Maryland. In 2000, he was appointed adjunct professor of economics at George Washington University.
   He joined the Defense Department as an analyst in 1978 and was twice awarded the Defense Exceptional Service Medal, in 1998 and 2000.
   We will not forget him.

   Steven D. Jacoby, 43, was the chief operating officer for Metrocall, Inc., a wireless data and messaging company. He was a passenger on board American Airlines Flight 77, heading for a seminar in Los Angeles.
   Mr. Jacoby, who was known to colleagues as Jake, was an executive with FirstPage USA from 1988 until its merger with Metrocall in 1994. “He wanted to do everything he could for our company,” said Vince Kelly, Metrocall’s chief financial officer. “He was not only a business colleague but a close personal friend.”
   Survivors include his wife, Kim, and children Nicholas, Jesse and Jenna.
   We will not forget him.

   Lt. Col. Dennis "Den" Johnson, 48, was the chief of personnel services at the Pentagon, working directly for the deputy chief of staff for personnel.
   He served the U.S. Army in a wide variety of command and staff assignments during his 25-year career. He treated everyone in his department like a member of his family, making sure each knew they could come to him if they had a problem of any kind.
   He loved gardening, working in the yard and spending time with his family. He also enjoyed bird-watching. His wife of 22 years, Joyce, described him as "quiet, gentle, fun-loving and extremely dedicated to his job."
   Survivors include his wife and daughters Dawn, 20, and Cassie, 16.
   We will not forget him.   

   Judith L. Jones, who worked in the Pentagon, sent the following email to some friends less than an hour before the Sept. 11 terrorist attack. Michelle Bush, her daugher, said it "epitomizes the kind of friend she was."

   Ann Campana Judge, 49, arranged trips around the world for National Geographic Society writers, photographers and executives. She was on board American Airlines Flight 77 with six Washington D.C. students and teachers on a National Geographic-sponsored trip to the Channel Islands in California.
   A graduate of Ohio Wesleyan University, she worked for National Geographic for 22 years. Her colleagues recalled her enthusiasm for travel and her passion for geography. John M. Fahey, Jr., president and chief executive of the society, called her "an extraordinary lady — well known and loved by almost everybody here." On Thanksgiving, she often invited single coworkers to her home for dinner.
   We will not forget her.