Boston celebrated two centennials in 2012—the building of Fenway Park for the Boston Red Sox and the founding of the Boston Police Department's motor unit, which is known as the Mobile Operations Patrol (MOP) unit. The two centennials came together on Sept. 16, when agency brass recognized the unit's heritage during a ceremony in front of Fenway's "green monster" wall in left field. Photos courtesy of Robert Anthony.
Boston Motor Patrol

A 1929 Boston P.D. tribute motorcycle on loan from the American Police Motorcycle museum.

A memorial listing the six motorcycle officers killed in the line of duty was unveiled on Sept. 16 in front of the mobile operations patrol base.

Police Commissioner Edward Davis and Superintendent In Chief Dan Linskey holding the 100 MOP flag in front of the "green monster" at Fenway Park.

Donna Lovemu, the granddaughter of Patrolman William Abbot, places a rose onto the silent motorcycle. Abbot was killed in the line of duty on Nov. 28, 1931.

Boston P.D. motor officers wear a centennial pin with this logo.

Boston motor officers pose with their Indian motorcycles in 1923.

The Boston motor unit provided an escort for President Dwight D. Eisenhower down Tremont Street in the 1950s.

Patrolman Brad Donahue on his Indian in 1929.

Boston police on parade on Beacon street in 1923.

Patrolman Brad Donahue in 1923 with his Indian motorcycle.