In 2015 the U.S. Army announced the move from the Universal ACU pattern to the Scorpion OCP pattern,
with the Air Force later announcing the same transition to Scorpion OCP.

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Operational Camouflage Pattern (OCP), originally codenamed Scorpion W2, is a military camouflage pattern adopted in the mid-2010s by the United States Army for use as the U.S. Army's main camouflage pattern on the Army Combat Uniform (ACU). This pattern officially replaced the U.S. Army's previous Universal Camouflage Pattern (UCP) as the official combat uniform pattern for most U.S. soldiers at the end of September 2019. The pattern also superseded the closely related MultiCam, a pattern previously used for troops deploying to Afghanistan. The United States Air Force is also replacing their Airman Battle Uniform with the ACU in OCP after positive feedback from airmen who wore the uniform while being deployed to Afghanistan with Army soldiers.

The original "Scorpion" pattern was developed by a joint venture of the Army's Natick Labs and Crye Precision as part of the Objective Force Warrior (OFW) program more than a decade prior. Crye then modified it to create MultiCam for commercial sales. In July 2014, the Army announced that OCP could be used in the field by the summer of 2015.

In early April 2015, Army Chief of Staff Ray Odierno revealed that OCP uniforms were beginning to be issued to deployed soldiers going to Afghanistan, Iraq, Europe, and the Horn of Africa. The OCP ACU became available for soldiers to purchase starting 1 July 2015.

More installations began sales later in 2015, although soldiers deploying on real-world missions will receive uniforms and equipment printed in OCP. The T-shirt and belt in the new Coyote 498 color are available, though soldiers are allowed to continue to wear their current T-shirt, belt, and boots in Tan 499 until October 2019, when the new pattern becomes mandatory. Body armor, packs, and pouches in previous UCP and MultiCam patterns will be worn until they can be replaced with OCP.

On 14 May 2018, the U.S. Air Force announced that all airmen will transition from the Airman Battle Uniform to the OCP uniform. All Airmen will be allowed to wear OCP uniforms beginning 1 October 2018. Recruits in basic training, and cadets in Air Force Reserve Officer Training Corps, and Officer Training School will start being issued OCPs on 1 October 2019. All Airmen will be required to own OCP uniforms by 1 April 2021.

The U.S. Space Force has also adopted the OCP uniform, but with navy blue thread for ranks and tapes.