WORLDWIDE — Some major changes are coming for the U.S. Air Force dress code.

Announced Monday, leaders say the service will move to a single combat utility uniform.

The service will ditch the Airman Battle Uniform, known as the ABU, and begin wearing the Operations Camouflage Pattern or OCP, starting Oct. 1, 2018.

The Air Force will differ from the Army in velcro patches, name tape and insignia by using a "spice brown" color, Maj. Gen. Robert LaBrutta, Air Force director of military force management policy, and deputy chief of staff for manpower, personnel and services told Military.com.

It's already in use by the Army and Airmen in combat zones.

The uniform works in all climates and it's adoption will eliminate the need for two separate uniforms — one for the home station and one for deployments.

More than 100,000 Airman have been issued the uniforms or are already wearing OCPs

The service will fully transition by April 1, 2021.

TIMELINE OF ROLL OUT (COURTESY/AIR FORCE TIMES)

July 2018: The Air Force expects to release an Air Force guidance memorandum on how to properly wear the OCP uniform.

Oct. 1: ”Optional wear” of the OCP will begin. That means anyone who already has the uniform hanging in his or her closet ― such as from a previous deployment to Afghanistan ― will be able to wear it.

Also that month, OCPs will go on sale at AAFES stores at a handful of bases ― Aviano Air Base in Italy, Joint Base Charleston in South Carolina, MacDill Air Force Base in Florida, and Shaw Air Force Base in South Carolina.

The Air Force will gradually expand from there, as the Defense Logistics Agency ramps up its ability to produce more of the new uniforms.

April 1, 2019: More AAFES stores ― but not yet all ― will start to get the OCP.

Oct. 1, 2019: New airmen coming in through basic military training, officer training school, and the Reserve Officer Training Corps will get their OCPs beginning next October, when LaBrutta said the production capacity is expected to be able to meet that demand.

Military training instructors and military training leaders will also start wearing OCPs at that time, to demonstrate proper dress and appearance standards to trainees.

AAFES is expected to start selling OCPs online next October as well.

June 2020: All airmen must transition to coyote brown boots. The old sage green boots, which most airmen wear with their ABUs, or desert sand boots, worn by some who already have OCPs, will no longer be allowed.

April 1, 2021: The final deadline for all of the more than 500,000 total force airmen to be wearing OCPs, and stop wearing ABUs once and for all.