The U.S. Army developed an experimental 155mm truck-mounted howitzer, called the Brutus.
That was reported by Defence Blog.
The photos of experimental truck-mounted howitzer were published on the Facebook page of the 75th Field Artillery Brigade (artillery brigade in the United States Army) on 26 October.
The Brutus is a 155mm truck-mounted howitzer for increased mobility and enhanced firing capabilities. Experimental 155mm howitzer installed on an FMTV 6X6 truck chassis.
Howitzer is capable of using a wide range of ammunition for deployment against protected and unprotected targets. No further details on the type of howitzer have been released.