The monument with the large face on it (behind 1LT McKee) is the grave marker of Brigadier General Benjamin F. Kelley (1807 - 1891) and his wife Mary. Also shown, just to the left of BG Kelley marker, is the monument for Major George H. Rathgeber (1870 - 1928) and his wife Eleanor. He joined the Army in 1887, rose through the ranks, and was commissioned a 2nd Lieutenant in 1906. He fought with the Philippine Scouts during the Philippine Campaign, and retired in 1920 because of disability. He died at Walter Reed Hospital.

The dump truck is a 1927-28 Relay, made by Relay Motors Corporation in Lima Ohio. You can see the "R" on the hub cover of the back wheel as well as the slanted louvers on the hood and raised panel on the door which were characteristics of the larger models of the marque. Relay consolidated Commerce, Garford, and Service trucks under one corporation, but went out of business in 1933.

Has been lost over time...

being operated by Neil Young, Stephen Stills, or perhaps Richie Furay?

Yes, the 1960's band took its name from the steamroller manufacturer.
Mannheim Steamroller's moniker has nothing to do with a road-paving device. It is based on a German musical technique.

It's the sound of the steamroller that would give its name to a great rock band about 30 years later -- "For What It's Worth".

The gravestone with the cross and angel is that of First Lieutenant Thomas Hudson McKee. During the Civil War, McKee was an aide to Brigadier General Benjamin Franklin Kelley, who is buried beneath the gravestone with the bronze relief of his face.