In his first formal press conference since he was indicted last January on espionage charges, David Truong yesterday told reporters invited by his defense committee, "I am nobody's agent and nobody's spy."

Truong, flanked on a sofa by his two attorneys, said calmly but emphatically under the illumination of bright television lights, that he "would like to take this chance to straighten out a little the record" of his case.

Truong, a Vietnamese expatriate, said charges that he delivered stolen classified U.S. diplomatic cables to foreign agents was a government ploy to weaken attempts to normalize relations between Vietnam and U.S. Truong's codefendant, U.S. Information Agency employe Ronald L. Humphrey, is still in jail on $150,000 bond. Humphrey is accused of stealing the cables and delivering them to Truong.

Truong was released from the Alexandria jail last Friday after posting a $250,000 bond.

Truong said he and his family have only worked to "bring Americans and Vietnamese people together."

The press briefing was sponsored by the Vietnam Trial Support Committee which was formed to "assure an adequate defense for David Truong," according to one of numerous leaflets distributed at the meeting. The committee so far has spent less than $1,500 for Truong, according to committee member Carl Rogers and will be showing a Vietnam-related film, "Coming Home" at three Washington theaters April 30 to raised more money.

The committee, composed of many Truong's friends, is for Truong's benefit, not Humphrey's.