BAE Systems Land and Armaments is the new, Arlington division of British-based BAE Systems. It was created with the completion last week of BAE's $4.2 billion acquisition of United Defense Industries of Arlington. The new operation has 11,000 employees at locations in the United States, Britain, Sweden and South Africa. The acquisition brings BAE Systems' U.S. presence to nearly 35,000 employees, the company said.

NVR of Reston, one of the nation's largest homebuilders, said it plans to split its chairman and chief executive duties on July 1, when Dwight C. Schar steps down as chief executive. He will remain chairman. Chief financial officer Paul C. Saville is to become chief executive.

AES of Arlington, an international power company, announced that chief financial officer and executive vice president Barry Sharp would resign by year's end.

Cel-Sci of Vienna, which is attempting to develop treatments for cancer and infectious diseases, said the American Stock Exchange has notified the company that it may be delisted for failing to meet its minimum standards for shareholder equity and profits. The company said it will submit a plan to regain compliance.

MobilePro of Bethesda, a wireless technology and broadband telecommunications company, acquired Evergreen Open Broadband of Boston, a wholesale wireless Internet service provider, for an undisclosed amount of stock and assumed liabilities.

Skehan Communications Group and East Coast Television, two Washington television and video production companies, are to join forces Friday as East Coast Television. Terms were not disclosed.