Major Daniel J. Mulcahy is a native of Houston, TX. In 2003, he graduated from Pope John XXIII High School in New Jersey. Major Mulcahy attended Villanova University and graduated with a Bachelor's Degree in Criminal Justice in May of 2007. He was commissioned into the Marine Corps through the university's NROTC program. Major Mulcahy attended The Basic School in July of 2007 and subsequently attended Infantry Officer's Course.
After graduating Infantry Officer's Couse in April 2008, Major Mulcahy was assigned to Lima Company, 3d Battalion, 8th Marine Regiment, 2nd Marine Division to serve as a platoon commander. During this tour, he deployed to Now Zad, Helmand Providence, Afghanistan in support of Operation Enduring Freedom. He then deployed to Delaram, Afghanistan, with Regimental Combat Team-2, as the Headquarters Company Executive Officer. At the end of the deployment, he was transferred to Kilo Company, 3d Battalion, 5th Marine Regiment, to serve as the Weapons Platoon Commander in Sangin, Afghanistan.
In April 2011, Major Mulcahy re-deployed and reported to 1st Reconnaissance Battalion, 1st Marine Division. After attending several courses, he deployed to OEF with 1st Marine Division (FWD), as the Deputy Counter-IED Officer. Following that deployment, he served as both a Platoon Commander and Executive Officer Alpha Company, 1st Reconnaissance Battalion. In July 2013, Major Mulcahy reported to Reconnaissance Training Company, School of Infantry-West to serve as the Officer in Charge of the Basic Reconnaissance Course.
In 2015, Major Mulcahy reported to 2nd Battalion, 4th Marines, 5th Marine Regiment. In 2016, he deployed to the 31st Marine Expeditionary Unit, as the Weapons Company Commander. In July 2017, he reported to 4th Reconnaissance Battalion, San Antonio, TX to serve as the Charlie Company Inspector-Instructor and subsequently the Operations Officer. Major Mulcahy then executed orders to Marine Corps Air Ground Combat Center (MCAGCC) in July 2020 to serve as the Assistant Operations Officer, 7th Marine Regiment. In March 2021, Major Mulcahy reported to 3d Light Armored Reconnaissance Battalion to serve as the Executive Officer.
Major Mulcahy was then assigned to the Tactical Training and Exercise Control Group (TTECG) aboard MCAGCC in July 2023. With TTECG, he served as the maneuver Section Officer in Charge and Assistant Operations Officer. Additionally, he served as an Advanced Maneuver Coyote, Coyote Corridor, and Event Lead for the MAGTF Distributed Maneuver Exercise.
In July of 2025, Major Mulcahy reported to Brunswick, Maine to serve as the Inspector-Instructor for A Company, 1st Battalion, 25th Marines.
Major Mulcahy's personal awards include the Meritorious Service Medal (3), Navy and Marine Corps Commendation Medal (3), Navy and Marine Corps Achievement Medal, and the Combat Action Ribbon.