Colonel Rob Weiler enlisted in the Marine Corps Reserve in 1992 obtaining the rank of corporal. He was commissioned a Marine Second Lieutenant in December of 1995 upon graduation from George Mason University in Virginia, his home state. Colonel Weiler completed The Basic School in September of 1995 and subsequently completed the Infantry Officer Course. He reported to 1st Battalion, 1st Marines and served as 1st Platoon Commander, Company A and deployed with the 13th Marine Expeditionary Unit and again with the 15th Marine Expeditionary Unit as the Executive Officer of Company A. In April of 2000, Colonel Weiler reported to Officer Candidates School and held the billets of Assistant Operations Officer, Platoon Commander, and Company Executive Officer. In January 2002, he reported to the United States Senate as a Military Legislative Fellow assisting with Foreign Policy, Veteran's' Affairs, and Defense issues for Senator Ben Nelson of Nebraska. Upon completion of the fellowship, Colonel Weiler attended the Advanced Armor Captain's Career Course in Fort Knox, Kentucky.
In June 2003, Colonel Weiler reported for duty with 2d Battalion, 4th Marines, 1st Marine Division. He assumed command of Weapons Company and transitioned it into the Mobile Assault Company and prepared them for combat operations in Iraq. Colonel Weiler led the Mobile Assault Company in support of Operation Iraqi Freedom II in Ar Ramadi, Iraq before being assigned as the Battalion Operations Officer in November 2005. As the BLT's Operations Officer he deployed with the 31st Marine Expeditionary Unit.
In January 2006, Colonel Weiler reported to Weapons Company, 2d Battalion, 24th Marines as the Inspector-Instructor where he later assumed command of the company and deployed in support of Operation Iraqi Freedom.
In June of 2008, Colonel Weiler departed Iraq and reported to the Marine Corps Command and Staff College followed by the School of Advanced Warfighting. Upon completion of the School of Advanced Warfighting, he reported to 1st Marine Logistics Group where he deployed to Afghanistan twice in support of Operation Enduring Freedom as an operational planner.
Colonel Weiler took command of 2d Battalion, 4th Marines on 22 June 2012 and deployed with the 31st Marine Expeditionary Unit. Following command, he graduated from the Marine Corps War College in 2015 then served in the Office of the Secretary of Defense, Strategy and Force Development for three years. Colonel Weiler just completed a short tour as the Director of Inspections, Inspector General of the Marine Corps.
His personal awards include the Silver Star, Purple Heart, Meritorious Service Medals, Navy-Marine Corps Commendation Medals with combat distinguishing device, Navy-Marine Corps Achievement Medals, and the Combat Action Ribbon.