[5] During his tenure as assistant director, Fettig led expansion of the band's educational outreach programs, organizing clinics for music students in the District of Columbia Public Schools and creating an annual Young People's Concert.

[5][7] He was advanced to colonel by order of President of the United States Donald Trump in an August 2017 promotion ceremony held in the Roosevelt Room of the White House.

[8] As director, Fettig led the Marine Band during live performances on Late Night with David Letterman and National Public Radio.

[4] In 2018, under Fettig's direction, the Marine Band was named as an artist in its first regional Emmy Award, given in the category Special Event Coverage Other than News and Sports, for the WNET-TV broadcast of the television special United States Marine Band "New England Spirit".

On July 20, 2023, the University of Michigan School of Music, Theatre & Dance announced that Col Fettig would be joining its faculty as Director of Bands and professor in the Department of Conducting, starting in January 2024.