The camouflage pattern for the Army Combat Uniform has since changed at least two times, starting with the Operation Enduring Freedom, or Multicam, pattern in 2010.
In 2015, the Army changed the ACU pattern to the Operational Camouflage Pattern, which became mandatory on Oct. 1.
The new pattern's colors vary by location — desert vs. forest, for example — but it generally has a four-to-six color palette incorporating greens, beiges, browns, tans and greys.
The OCP "has been optimized for performance across all the military operating environments that the Army may face. It has also been optimized for night-time operations," Col. Bob Mortlock with the Army's Project Manager Soldier Protection and Individual Equipment told Military.com in 2015 about the differences between OCP and Multicam patterns.
In May, the Air Force announced that it would also adopt the Army's OCP.