Photo of an M60 armored vehicle launched bridge (AVLB)
From a group of official US Army Photos that many seem to be taken at Detroit Arsenal.
This image was likely taken at one of the proving ground facilities.
Photograph Details
Subject
The M60 armored vehicle launched bridge (AVLB) is an armored vehicle based on the M60 Patton main battle tank's hull and used for the launching and retrieval of a 60-foot (18 m) scissors-type bridge. The AVLB consists of three major sections: the launcher, the vehicle hull, and the bridge.[