KINGSVILLE, Texas (AP) — Bo Atterberry is resigning as Texas A&M-Kingsville's football coach after leading the Javelinas to a 41-28 record in six seasons, including four winning seasons in a row.

In a statement issued by the university, Atterberry said: "This is simply an opportune time for me to pursue other career opportunities.

Defensive coordinator David Calloway has been promoted to be Atterberry's successor. It's his first head coaching position

Atterberry led the 2012 Javelinas to a third-place finish in the NCAA Division II Lone Star Conference, a Kanza Bowl bid and selection as conference co-coach of the year.

His 2009 team won the conference title, while his 2010 Javelinas achieved their first 10-win regular season in 21 years.

His resignation takes effect Dec. 31.