I photographed these M109 Paladin 155mm turreted self-propelled howitzer examples in Dubois and a pair posed together at the Mississippi Armed Forces Museum at Camp Shelby.
The M548 Caisson was designed specifically to accompany the M109 Self Propelled Howitzer
Two M109 Paladin SP Howitzers
These two examples were holding a banner for the Red-White-Blue competition on base that day.