Because of his military commitment (originally 8 years because he chose to fly), he dropped in the
1988 NFL draft until the
Dallas Cowboys took a chance and selected him in the
eleventh round, with no indication of an early out from the Air Force. President and general manager
Tex Schramm had also secured his rights by signing him to a multi-year contract with a $25,000 bonus in
1988. After the 1991
Gulf War, the United States military underwent an across the board reduction in budget and Hennings was able to have the remaining four years of his active-duty commitment (service academy and rated pilot) waived, which was unprecedented at the time. He continued service in the Air Force Reserve for nine years as a liaison officer to the Air Force Academy after his separation from active duty, then went into the
Individual Ready Reserve. While entering into the
NFL, there were some rumors about the Cowboys trading him to the
Denver Broncos, but when
Jimmy Johnson saw his workout for the team, those plans were canceled. In
1992, he left the
U.S. Air Force and joined the
Dallas Cowboys as a 26-year-old rookie, playing on
special teams and quickly becoming a key reserve, on one of the best
defensive line rotations in the
NFL. In
1995, he registered his first starts while
Leon Lett was serving a four-game suspension. The next year, he replaced
Russell Maryland who left via
free agency to the
Oakland Raiders. While his play on the field was impressive, his attitude, character, and leadership were equally important to the Cowboys’ success during that decade. Together, these qualities helped shape the top-ranked defenses of the early nineties and contributed to the team winning three
Super Bowls in four years. He spent nine seasons with the team, before retiring after missing half of the
2000 season with injuries. He finished with 27.5 sacks, 6 fumble recoveries and one
touchdown in 107 games. ==Personal life==