In a major administrative change, Riggs National Bank has divided its branch system into four regions, each with a regional manager. Promoted to fill the new posts were vice presidents Cecil B. Dunn, Melvin J. Hileman, William K. King and William L. Teachum.

Dunn has been with Riggs since 1931 and is now manager of the main office. Hileman began his banking career with Washington Loan and Trust Co., which merged with Riggs in 1954, and currently manages Riggs' Dupont Circle office. King has been with Riggs for more than 35 years the last 20 at Farmers and Mechanics Branch. Teachum, manager of the bank's Federal Office, has been with Riggs since [WORD ILLEGIBLE]

[WORDS ILLEGIBLE] has been elected chairman of the board of Arlington Trust Co., succeeding Gen. George H. [WORD ILLEGIBLE] Sr., who recently retired after 17 years as chairman. Mount started with Arlington Trust in 1934 and became president and a member of the board in [WORD ILLEGILBE]

oderick K. Gaines has been appointed by Trans World Airlines as city vice president in charge of TWA's Baltimore-Washington sales and service region. He has served in a variety of positions since joining TWA in [WORD ILLEGIBLE] most recently as director of cabin services.

Jack R. Jones has been elected chairman of the board of First Federal Savings and Loan Association of Arlington, replacing Roy H. Halquist, who has been named director [WORD ILLEGILBLE] Jones is currently a director of peoples. Life Insurance Co. and is chairman of the board of Fork Union Military Acsdemay. He has been on the board of First Federal since 1959.

In an expansion of its top management ranks, Newsweek International last week announced appointments to several newly created positions.

In New York, Howard W. Smith will become associate publisher and Kevin McEnery executive director of Newsweek International; in London, Michael G. Conroy will become Atlantic edition publisher and Paul Haleman executive director; in Hong Kong, Peter J. Luffman will become Pacific edition publisher and Shinyoks Sal executive director.

Newsweek International publisher Mark M. Edmistos said, "One major benefit of this expansion will be to allow those people most familiar with each area to respond effectively to the needs of our readers and advertisers."

A Labor Department unit to probe fraudulent claims in three workers' compensation programs is to be headed by Gerald G. Gotsch.

He will supervise investigations of federal employees compensation, longshoremen's and harbor workers' compensation and black lung benefits.

Before joining the Labor Department in 1959, Gotsch was an investigator with the Senate Select Committee en Improper Activities in the Labor-Management Field (the McClellan committee).

The executive vice president of Virginia Electric and Power Co., William W. Berry, has been named to the board of Virginia National Bankshares and its Richmond affiliate, Virginia National Bank/Richmond. Berry joined Vepco in 1957.

Alvin A. Underwood has been elected a vice president of Garfinckel, Brooks Brothers, Miller and Rhoads, Inc. Underwood is the newly appointed president and chief executive officer of Miller's Inc., a wholly owned of subsidiary, which he joined in 1961.

Washington area residents Paul Swenason and Jim Reichly have joined the board of directors of the Pottsville, (Pa.) Republican Swenason is a newspaper veteran of 45 years who now runs a consulting service. Reichly worked with Fortune Magazine and as an assistant to former President Ford before joining Brookings Institution as a senior fellow.

Directors of Communications Satellite Corp. elected Richard S. Bodman senior vice president in charge of finance and corporate development; elective Feb. 1. Bodman was assistant comptroller and director of the corporate accounting division of E. L. duPont de Nemours and Co., and earlier was assistant secretary for management and budget in the Department of Interior.

Marriott Corp. has named Peter R. Grimm executive vice president for Fairfield Farm Kitchens, its food production and distribution facility. Grimm was president of MartinBrower Co., a national food distribution firm headquartered in Chicago whose biggest customer is McDonald's restaurants.

Clarendon Bank and Trust promoted Charles R. Fenimore to vice president. Promoted to assistant vice presidents were Kathryn O. Talbert, Robert M. Hawthorne, Roy B. Moss Jr., Deborah N. Green and John W. O'Neill.

New president of the Washington metropolitan chapter of the Community Association Institute (CAI) is Ronald P. Kirby, vice president and project manager of Watergate at Landmark, Alexandria. CAI is a group of builders, developers, homeowners, public officials and property managers who build, own, operate live on common-interest communities.