U.S. Army universal camouflage trials
The U.S. Army universal camouflage trials took place from 2002 to 2004 with the goal of creating a single pattern that would provide adequate concealment in all environments. Four different patterns in a total of 13 variations were tested during the evaluation: three woodland patterns, three desert, three urban, three desert/urban, and one multi-environment pattern.
Source: Wikipedia — U.S. Army universal camouflage trials (CC BY-SA 4.0)