32 CFR 636.35 - Headphones and earphones.
The wearing of headphones or earphones is prohibited while driving a U.S. Government vehicle, POV, motorcycle, or other self-propelled two-wheel, three-wheel, or four-wheel vehicle powered by a motorcycle type engine. This does not negate the requirement for wearing hearing protection when conditions or good judgment dictate use of such protection.
Title 32 published on 2014-07-01
no entries appear in the Federal Register after this date.