Actually did well on floral pattern couches and rock quarries.Don't you mean OCP? ACU is the grey digital one that didn't work anywhere AFAIK.
ACU is the uniform UCP was the pattern.
OCP is the modern pattern.
ACU means Army Combat Uniform. It refers to the garment not the pattern.
UCP was "Universal Camouflage Pattern"
A grey green tan pixilated pattern
OCP is "Operational Camouflage Pattern"
based of an improved version of Scorpion W2 which modified is the basis of The Commercial Multicam which the Chinese did clone but not the Military form which is darker.
The style of the uniform is that of gen one ACU compete with Manderin collar. These are features that later changed in the modern version along with the pattern.