First Sergeant Heincy assumed his duties as First Sergeant, Battery D, 2d Battalion, 14th Marine Regiment on 13 May 2015.
He joined the Marine Corps in November 1998 and completed Recruit Training at Marine Corps Recruit Depot San Diego. He then attended School of Infantry at Camp Pendleton where he became a rifleman.
In May of 1999, Private First Class Heincy reported to Delta Company, 4th Reconnaissance Battalion and was placed into the Recon Indoctrination Platoon.
In January 2003, Corporal Heincy deployed in support of Operation Enduring Freedom and Operation Iraqi Freedom with Delta Company, 4th Reconnaissance Battalion. During this deployment he served as an assistant team leader.
In November 2004, Sergeant Heincy was activated and assigned to 7th Platoon 1st Force Reconnaissance Company. He deployed in January 2005, as a team leader for Team 3 in support of Operation Iraqi Freedom.
In November 2006, Sergeant Heincy was activated and assigned to 1st Platoon 4th Reconnaissance Battalion Task Force Tomahawk. He deployed in January 2007, as the team leader of Team 2 in support of Operation Iraqi Freedom.
First Sergeant Heincy was promoted to Staff Sergeant in October 2007. He served as the Platoon Sergeant for 1st Platoon, Delta Company, 4th Reconnaissance Battalion for the next three years.
In April 2011, First Sergeant Heincy was promoted to Gunnery Sergeant. In October 2012, he was assigned to Marine Forces South Security Cooperation Team as the SNCOIC for team 2. His team deployed to El Salvador, Guatemala, and Honduras in support of security cooperation engagements.
First Sergeant Heincy’s personal decorations include the Navy Marine Corps Commendation Medal with one gold star, Navy Marine Corps Achievement Medal w/V and three gold stars, and the Combat Action Ribbon.