Joshua D. Dannemiller was born in St. Petersburg, Florida, and graduated from Chippewa High School in Doylestown, Ohio, in 2003. That same year, he enlisted in the United States Marine Corps and completed recruit training with Echo Company, 2nd Recruit Training Battalion, Marine Corps Recruit Depot Parris Island, South Carolina, earning the rank of Private First Class.
Upon completion of recruit training in October 2003, Private First Class Dannemiller attended Marine Combat Training at the School of Infantry, Camp Geiger, North Carolina. Following graduation, he received orders to "The Commandant's Own" United States Marine Drum & Bugle Corps, where he served as a contrabass bugler. He was promoted to Lance Corporal in February 2004 and selected as a soloist for the 2004 parade season.
In October 2004, he was promoted to Corporal and served as the Public Affairs Noncommissioned Officer in Charge for the Drum & Bugle Corps. In May 2005, he was promoted to Sergeant and assigned as section leader for the contrabass bugles.
Promoted to Staff Sergeant in March 2010, Dannemiller was assigned as the Staff Noncommissioned Officer in Charge of the ceremonial field crew and rooftop fanfare section. Later that year, he assumed duties as low brass instructor and was competitively selected as Staff Noncommissioned Officer Director for the Friday Evening Parades in 2010, 2013, and 2015. As a Staff Sergeant, he also performed as a contrabass bugler soloist, most notably appearing at Lincoln Center in New York City in a joint concert with the New York Philharmonic.
In 2012, Staff Sergeant Dannemiller was selected as principal brass instructor, leading 56 Marines in daily rehearsals while coordinating closely with the Director and instructional staff. During his tenure, he contributed to the production and editing of the CD For the Color and revitalized MOS proficiency standards. He was also hand-selected by the Director to research and develop new custom bugles for "The Commandant's Own."
In October 2015, he was promoted to Gunnery Sergeant and, in October 2016, was selected as Assistant Drum Major. He was promoted to Master Sergeant in July 2020 and appointed Drum Major in May 2022. In September 2023, he was promoted to Master Gunnery Sergeant.
Master Gunnery Sergeant Dannemiller holds a Bachelor of Business Administration from the University of Maryland Global Campus. His personal decorations include the Navy and Marine Corps Achievement Medal, the Navy and Marine Corps Commendation Medal, and the Meritorious Service Medal.