Lieutenant Colonel Dennis Katolin graduated from Truman State University in 2002 and was commissioned that same year.
Lieutenant Colonel Katolin reported to The Basic School in January 2003, and upon completion, attended the Communications and Information Systems Officer Course, graduating in 2003.
In January 2004, Lieutenant Colonel Katolin moved to MCAGCC 29 Palms and reported to 3rd LAR Battalion to serve as the S-6A until May 2004. He then became the S-6 for 1st Battalion, 7th Marines and was the Communications Platoon Commander. In September, 2004, Lieutenant Colonel Katolin deployed with 1/7 to Al Qaim, Iraq (along the Iraq/Syrian border) and again in 2006.
After returning from Iraq in October of 2006, Lieutenant Colonel Katolin executed orders to Second Fleet Command in Norfolk, Virginia to serve as the Marine C4 Officer on the N-6 staff. He was also designated as the Joint C4 planner as Second Fleet was becoming a Joint Task Force (JTF SOUTH) for SOUTHCOM.
In the summer of 2009, Lieutenant Colonel Katolin reported to EWS and later attended the Advanced Communication Officers Course (ACOC) 2010. After EWS, he reported to 9th Communication Battalion where he assumed command of C Company and, in May, 2011, became the Commanding Officer of B Company which deployed to Afghanistan and facilitated communications for the I MEF (FWD) CE for RC(SW).
Upon returning from Afghanistan, Lieutenant Colonel Katolin reported to I MEF G-6 as the Assistant Operations Officer, where he was the primary C4 planner for I MEB and supported Pacific Horizon 2012, Dawn Blitz 13.1 and 13.2, coordinating with the MEF staff as well as ESG-3.
After serving on the MEB staff, Lieutenant Colonel Katolin received orders to serve as a Faculty Advisor at Expeditionary Warfare School from 2013 to 2016. He was the course director for the MCMAP program, ethics, amphibious C4, and Communications Occupational Field Exercise modules of instruction. He received the Elihu Rose Award for teaching excellence in 2016.
In 2016, Lieutenant Colonel Katolin was assigned to 9th Communication Battalion and served as the Operations Officer. He planned 5 Battalion level exercises in support of the I MEF Commanding General and also provided C4 detachments for MEB level exercises Pacific Horizons, Dawn Blitz, and Native Fury. He planned the reorganization of the Battalion in accordance with HQMC’s Force Modernization 2025 as well as established the first Defensive Cyber Operations cadre organic to I MEF.
In 2018-2019, Lieutenant Colonel Katolin attended the School of Advanced Warfighting.
His last assignment was as the MAGTF Planner assigned to the Plans and Strategy Division for the Deputy Commandant for Information.
Lieutenant Colonel Katolin is a 3rd Degree Black Belt Martial Arts Instructor Trainer in MCMAP and was a winner of the Commandant’s Innovation Challenge in 2017 for writing a proposed doctrinal publication on ethics.
Lieutenant Colonel Katolin’s personal decorations include the Meritorious Services Medal w/gold star, the Navy and Marine Corps Commendation Medal, the Navy Marine Corps Achievement Medal w/gold star, and the Combat Action Ribbon.