Sgt. Ryan Jones, a native of Penfield, N.Y., practices playing his French horn in one of the rehearsal rooms at the band hall aboard Marine Corps Recruit Depot San Diego. Jones has been playing the French horn for 12 years, but is turning in his horn to re-enlist and change his current military occupational specialty to Reconnaissance. - Sgt. Ryan Jones, a native of Penfield, N.Y., practices playing his French horn in one of the rehearsal rooms at the band hall aboard Marine Corps Recruit Depot San Diego. Jones has been playing the French horn for 12 years, but is turning in his horn to re-enlist and change his current military occupational specialty to Reconnaissance.