Thanks for the clarification on the 1st Cav's history. I know they were one the highest decorated units in Vietnam and had a long and proud combat record there.
A little side story. One of the 1st Cav units was passing through on a unit move and RON'd at our base camp. Rivallry between us and them required a little "decoration" of equipment. As the sun came up we discovered nice, bright yellow CAV patches stencilled on anything they could get to that wasn't physically occupied or guarded. It took them a little longer to discover all their aircraft had our big red rat (our red kangaroo marking) stencilled on them.