The M55 is an American fully enclosed and armored self-propelled howitzer based on the M53 155 mm self-propelled gun and with components taken from the M47 Patton.
M55 howitzer in the US Army Ordnance Museum
The M107 175 mm self-propelled gun was used by the U.S. Army and U.S. Marine Corps from the early 1960s to the late 1970s. It was part of a family of self-propelled artillery that included the M110. I
M107 self-propelled gun in Dutch service.
Dutch artillerymen prepare to fire the M107 howitzer.
An M107 fires in support of US troops near the Cambodian border as part of Operation San Angelo in 1968.