Captain Dale O. Jinkens, commanding officer of Troop D, Springfield, is pleased to announce the assignment of five new troopers to Troop D. The following troopers were members of the Missouri State Highway Patrol’s 125th Recruit Class that graduated from the Patrol Academy on April 10, 2026.

Trooper Joseph DeMasi will be assigned to Zone 1, which serves the citizens of Greene County. DeMasi is an Eagle Pass, TX, native who graduated from Mount Vernon High School in 2016.

Trooper Austyn Mendoza will be assigned to Zone 15, which serves the citizens of Stone and Taney counties. Mendoza is a native of Conway, AR, who graduated from Two Rivers High School in 2015. Mendoza also served in the United States Air Force for five years.

Trooper Aaron Powell will be assigned to Zone 1, which serves the citizens of Greene County. Powell is a native of St. Croix, United States Virgin Islands, who graduated from Republic High School in 2017.

Trooper Keaton Siebenaler will be assigned to Zone 8, which serves Vernon and Barton counties. Siebenaler is a native of Wickenburg, AZ, who graduated from Stockton High School in 2010. Siebenaler also attended Missouri Southern State University.

Trooper Roy Wommack will be assigned to Zone 16, which serves the citizens of Hickory and Dallas counties. Wommack is a native of Springfield, MO, who graduated from Buffalo High School in 2012. Wommack also served in the United States Marine Corps for five years.

Photographs of the troopers can be found with this news release on the Patrol Website.

Follow the Missouri State Highway Patrol Troop D on X @MSHPTrooperD

The Missouri State Highway Patrol is hiring! The Patrol offers over 60 career paths. For all current openings, visit the Patrol’s online employment application page or to apply for trooper or commercial vehicle officer positions, visit the Patrol’s trooper and commercial vehicle officer page to apply today.

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