Lieutenant Colonel Halligan, a native of Toronto, Ohio, enlisted in the Marine Corps Reserve and completed Recruit Training at Parris Island, South Carolina in August 1997. In 1998, Lieutenant Colonel Halligan enrolled in the PLC program and received his commission upon completing Officer Candidate School and graduating from Ohio University in 1999.
Upon completing the Basic Officer Course and Adjutant Course, Lieutenant Colonel Halligan was assigned to the Administration and Resources Management Division, HQMC. In February 2001, he transferred to Marine Corps University/Education Command where he served as Deputy Assistant Personnel Officer and Aide de Camp to the President, Marine Corps University/Commanding General, Education Command.
In January 2003, Lieutenant Colonel Halligan transferred to 3d Marine Regiment where he served as Regimental Adjutant and deployed in support of OIF where he served as the Officer-in-Charge, I MEF Joint Reception Centers-Kuwait.
In August 2005, Lieutenant Colonel Halligan transferred to MARCENT for assignment as the G1 Plans Officer and Deputy AC/S G1. During this assignment, Lieutenant Colonel Halligan served as a standing member of the MARCENT Planning Group and participated in the following planning initiatives: transition of responsibilities from the Marine Corps to the Navy in the Horn of Africa, disestablishment and transition of Combined Forces Command-Afghanistan, the Organizational Assessment Working Group - tasked to “right-size” the OIF MAGTF, the redeployment and retrograde of Marine Forces from OIF; and served as the lead manpower planner for the re-introduction of Marine Forces into Afghanistan.
In July 2009, Lieutenant Colonel Halligan transferred to III MEF for assignment as Head, G1 Operations and Plans branch. In this capacity, he managed and synchronized the efforts of the future and current operations sections while also serving in a dual-hatted role as the G1 Plans Officer. In January 2011, Lieutenant Colonel Halligan deployed back to the USCENTCOM AOR to conduct an independent assessment of the processes and procedures for reporting the strength of the Afghan National Police; the results of this assessment were published in a comprehensive report provided to NATO and DOD. Following the earthquake and tsunami that struck mainland Japan in March 2011, Lieutenant Colonel Halligan served as the JTF 505, J1, Operations and Plans Branch Head in support of Operation PACIFIC PASSAGE and Operation TOMODACHI.
In November 2011, Lieutenant Colonel Halligan deployed in support of OEF where he served as the MAGTF Transition LNO and ANSF Development Planner within the RC-Southwest C-10. In this capacity, he coordinated and executed key interest items related to manpower, administration, Security Force Assistance (SFA), SFA Advisor Teams, and MAGTF operations with numerous organizations throughout the CJOA, USMC Service Components and HQMC.
In August 2012, Lieutenant Colonel Halligan transferred to HQMC for assignment as Policy Analyst, Plans and Policy Division, Manpower and Reserve Affairs where he was responsible for coordinating with DOD, DON, other services and internal departments on policies that impact the Marine Corps. These policies included, but were not limited to: the Post 9/11 GI Bill, the College Loan Repayment Program, the National Call to Service Program, hazing, fraternization, tattoos, telework, and High Deployment Pay.
In June of 2016 Lieutenant Colonel Halligan was awarded a Masters Degree in Military Studies from the Marine Corps Command and Staff College where he also participated in the Advanced Studies Program (ASP). Upon graduation, Lieutenant Colonel Halligan was assigned as the Assistant Chief of Staff (G-1) for Marine Corps Recruiting Command. On 1 June 2018, Lieutenant Colonel Halligan assumed command of 3rd Recruit Training Battalion, MCRD Parris Island. His personal decorations include the Bronze Star Medal, Joint Service Commendation Medal, Meritorious Service Medal, Navy and Marine Corps Commendation Medal, and Navy and Marine Corps Achievement Medal. He is married to the former Marissa J. Woodring and they have two children – Colin (15) and Cailee (13).