The body of Chester William Martin Jr., 69, a retired president of the Pepsi-Cola Bottling Co. of Washington and a former president of the Metropolitan Washington Board of Trade, was identified yesterday by Virginia State Police officials at Fort Pickett, Va.

Mr. Martin, who lived in Bethesda, had been listed as missing since last Aug. 20 when the Piper SuperCub airplane he was flying disappeared on a flight from Fredericksburg, Va., to Manassas. The wreckage of the plane was found Thursday in an area of Fort Pickett used as an artillery range.

Mr. Martin was born in Akron, Ohio. He attended the University of Georgia. In 1933, he joined the Coca-Cola company in Chicago. During World War II, he served in the Marine Corps in the Pacific and retired from the Marine Reserves with the rank of major.

In 1954, he joined Pepsi-Cola in New York as an assistant to the president. He transferred to the Pepsi-Cola Bottling Co. of Washington the following year and became president of the firm in 1956. He retired in 1978.

He also was chairman of Colgan Airways, which is based in Manassas.

Mr. Martin was a former chairman of the Washington Visitors and Convention Center; a founder and chairman of Heroes, Inc., an organization that assists the families of police officers and firefighters killed in the line of duty; a chairman of the Cherry Blossom Festival; a president of the Carbonated Beverage Manufacturers Association, and a past president of the Washington chapters of the Circus Saints and Sinners Club and the National Football Foundation & Hall of Fame. He was active in the Boy Scouts, the Police Boys and Girls Club and many other groups.

He was a member of the Federal City Council, the Kiwanis Club and the Congressional and Columbia country clubs.

Survivors include his wife, the former Margaret Isabel Huckins of Bethesda; four children, C. William IV of Annapolis, Margaret Cohen of Atlanta, G. Hall of Washington, and Stephen of Silver Spring; and seven grandchildren.