The
Chicago Bears drafted DeLong in the first round of the
1965 NFL draft (6th overall). The Bears had three of the first six draft picks that year, and had taken future Hall of Famers
Dick Butkus (No. 3) and
Gale Sayers (No. 4) ahead of DeLong. The
San Diego Chargers selected DeLong in the first round of the
1965 AFL draft (6th overall). Bears' assistant coach and personnel director, and a future Hall of Fame head coach,
George Allen was in charge of the Bears' draft that season. He later said he had reached an agreement with DeLong and when presenting it for finalization to Bears' owner
George Halas, DeLong added that he also wanted a car. Halas asked what kind of car, and DeLong said "nothing fancy ... Ford, Chevrolet". Halas responded "Well kid ... I know where you could get a good used car". DeLong chose to play for the Chargers. In 1970, DeLong himself said "I didn't like the weather there ... It was 16 below zero the day I visited Chicago. Another thing was that they were an old team. San Diego was a young club and I liked the opportunity. I've never regretted the choice". DeLong had a seven-year career with the Chargers, before finishing his career with one final NFL season as a Chicago Bear. He played mostly on
special teams. The Chargers were 9–2–3 in 1965, and reached the
AFL championship game, losing 23–0 to the
Buffalo Bills. DeLong was questionable to play in the championship game because of an injury, but is said to have played in that game. Head coach
Sid Gillman made DeLong a starter at right defensive tackle in 1966. DeLong replaced 1965 starting
All-AFL right tackle
Ernie Ladd, who left the Chargers for the
Houston Oilers before the 1966 season after an extended dispute over salary, trades and free agency. In 1967, Gillman moved DeLong to defensive end. He and DeLong believed the move would benefit DeLong, as playing tackle on the professional level had proved challenging for DeLong. Before the season even started, however, DeLong suffered a broken ankle in an August 27 exhibition game against the
Los Angeles Rams. DeLong did not return to play until November. He only started seven games that season, playing left defensive end. He had 1.5 sacks. Going into the 1968 season, DeLong believed that he could change his career trajectory, and meet the potential ascribed to him coming out of college three seasons earlier. Before the season, defensive line coach
Bum Phillips believed that positioning DeLong based on his being left-handed would be important for DeLong's improvement. DeLong was moved to right defensive end for that reason. He started all 14 Chargers' games at right defensive end, and led the Chargers with six sacks. After the season, DeLong believed the move to right end based on his being left-handed had helped him have his best season in the AFL to date. He was voted the team's most valuable player that season. He was named second-team All-AFL by the
Newspaper Enterprise Association. In 1969, DeLong led the AFL in quarterback sacks. Quarterback sacks did not become an official statistic in the NFL until 1982. It has been reported variously that DeLong had 15.5, Johnson played a 16-game season, and DeLong a 14-game season. The Chargers acquired defensive ends
Deacon Jones and
Lionel Aldridge before the 1972 season, and their top draft pick in 1972 was a defensive end (
Pete Lazetich), making DeLong expendable. Chargers coach
Harland Svare said before the trade he appreciated that DeLong had come into training camp in excellent physical condition with a desire to play, and looked better than he had during the 1971 season. He announced his retirement from professional football in July 1973. == Legacy and honors ==