Garrett Sitko is a visual instructor from Grand Blanc, Mi. He started his DCI career at Legends in 2016, where he continued to march for the 2017 and 2018 seasons. He later joined the Boston Crusaders for their 2019 season on baritone/trombone. Garrett graduated from the University of Michigan - Flint with his bachelors in Health Science and a concentration in Physical Therapy during the winter of 2022.

Since 2017, Garrett has been working with Michigan marching bands that have been successful in both MCBA and BOA circuits. He has worked with the Grand Blanc High School band program since 2017 and became the Visual Caption Head in 2020. Garrett joined the Plymouth-Canton Educational Park visual team for the 2021 season as a visual instructor, and continues to work with both programs. In addition to both of these programs, Garrett has instructed and choreographed for multiple high schools within Michigan including: Troy Athens, Linden, and Walled Lake Central. Garrett continues to teach within DCI as a visual instructor for the Boston Crusaders Drum and Bugle Corps.

During the winter season, Garrett continues to be a visual instructor and cymbal technician for Grand Blanc High School Indoor Percussion Ensemble and has since 2018. He has been a member of a few WGI Independent World Percussion ensembles including; Genesis Percussion based in Sparta, Michigan for the 2018 season; as well as Cap City Percussion based out of Columbus, Ohio for the 2020-2022 seasons; where he Aged Out in 2022.