American Security Bank announced last week that Walter W. Vaughan has joined the firm as senior vice president in charge of the bank's international banking division. He was previously employed by American Security from 1956 to 1976, before leaving to join the staff of Lincoln First Bank in Rochester, N.Y.

Kenneth H. Trout has been named Bak of Virginia's senior area executive in Northern Virginia and Stephen DiStefano has been promoted to senior regional operations officer in the bank's capital region.

Robert S. Ertter has been promoted to vice president and director of personnel for the National Bank of Fairfax. He will be responsible for the staffing of the bank's twelve branches and directing overall personnel policies and programs.

Edgar M. Boyd was named as new chairman of the executive committee of the Baltimore-based investment banking firm Baker, Watts & Co. He will be managing partner and will supervise leasing operations for the firm.

First American Bank of Virginia's vice chairman of the board, E. Guy Ridgely, retired last month concluding a 45-year banking career.

Insurance executive Samuel H. Turner has been elected a member of the central board of the Bank of Virginia. He is president of the Richmond-based Life of Virginia Company, a subsidiary of The Continental Group, Inc.