Eleven participants prepare for a Headquarters and Service Battalion-sponsored motorcycle ride to Manassas, Sept. 19, 2013. All Headquarters and Service Bn. riders and those from commands that don’t have a monthly motorcycle mentorship program, are invited to attend the monthly event. - Eleven participants prepare for a Headquarters and Service Battalion-sponsored motorcycle ride to Manassas, Sept. 19, 2013. All Headquarters and Service Bn. riders and those from commands that don’t have a monthly motorcycle mentorship program, are invited to attend the monthly event.