Leo Jacobo, a senior at Calvert Hall College High School, won the state Voice of Democracy contest, a national script-writing competition sponsored by the Veterans of Foreign Wars and its Ladies Auxiliary. Jacobo was awarded a $1,000 scholarship to the school of his choice and a $1,000 U.S. savings bond and will go on to compete nationally against all state winners in March. Sean Patrick Kennedy, a senior at La Plata High School, won second place, receiving a $500 savings bond and $250 in cash. Scott K. Winiecki, a senior at Overlea Senior High School, was awarded a $200 savings bond and $250 in cash for placing third. Each script is judged on delivery, originality and content. This year's contest theme was "New Horizons for America's Youth." Business Group Elects

James C. Rosapepe of College Park has been elected an associate trustee of the National Small Business Association. Rosapepe is chairman of the College Park Economic Development Committee and co-chairman of the Small Business Subcommittee of the Prince George's Economic Development Advisory Committee. Firefighter Honored

Larry W. Settle has been named firefighter of the month by the Prince George's County Fire Department. The volunteer deputy fire chief at the Fort Washington fire station, Settle was honored for his supervision during a house fire at 501 Lourdes Dr., Fort Washington, last November. Two people were rescued from inside the burning house. School Gets Book Money

During the recent Merit Awards Assembly at Crossland High School the school was surprised with a $1,000 check from Elks Lodge No. 2332, Camp Springs. The money is designated for new books for the school library media center, since county funds for school libraries in the last several years have been limited, leading to a book shortage. Crofton Woman Gets PGCC Post

Rose Mary Swartwood, a Crofton resident, has been selected acting associate dean of business and management at Prince George's Community College. A professor and department chairman of the Office Administration Department at the time of her appointment, Swartwood played a major role in developing the word processing laboratory. She received her master's and doctorate degrees from the University of Maryland.