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United States Army: Operation Atlantic Resolve
Latest update: August 2019
Operation Atlantic Resolve
In June 2014 the European Reassurance Initiative (ERI) came into effect after a visit by President Barack Obama to Poland. ERI funds Operation Atlantic Resolve (OAR) which demonstrates the United States commitment to peace, security and stability in Europe by deploying assets (air, land and sea) on a rotational bases. Most of the deployments are focused on the central and eastern European (NATO) countries with the deploying units commanded by US European Command (USEUCOM).

In January / February 2017 the US Army deployed its first brigades - Armored Brigade Combat Team (ABCT) and Combat Aviation Brigade (CAB) to Europe in support of OAR. The ABCT and CAB rotations are nine months. About two months prior to the start of a new rotation the US Army announces brigades who will deploy.

CAB's are shipped to a port in Europe (main contingents arrived in Belgium, Germany and The Netherlands with some helicopters shipped to Greece or airlifted to Germany). From their they fly to an air base for refuel and then continue to their destinations in southern Germany where the brigades are headquartered. The Blackhawks are forward deployed to the Baltic countries, Poland and Romania.
OAR rotations
  Rotation 1 Rotation 2 Rotation 3 Rotation 4 Rotation 5
  10th Mountain Division 1st Cavalry Division 4th Infantry Division 1st Infantry Division 3rd Infantry Division
  10th CAB 1st ACB 4th CAB 1st CAB 3rd CAB
Aircraft Feb '17 - Oct '17 Oct '17 - Jun '18 Jun '18 - Mar '19 Mar '19 - Nov '19 Nov '19 - Jul '20
AH-64D 24   24 20 20
AH-64E   24      
CH-47F 12 12 12 10 10
UH-60L/M 38 38 37 35 35
HH-60M 15 15 15 15 15
Total 89 89 88 80 80
CAB Combat Aviation Brigade
ACB Air Cavalry Brigade

The CAB's are composed of an Attack Reconnaissance Battalion, General Support Aviation Battalion, Assault Helicopter Battalion and an Attack Reconnaissance Squadron within an Cavalry Regiment. Each Battalion has three companies assigned.
Note: Except the flying companies an Headquarters and Headquarters Company (H&HC), Aviation Support Battalion and maintenance companies are assigned to CAB or Battalion level.

Details of the Combat Aviation Brigades can be found at the US Army section.
Rotation 1: Arrived in Germany and departed through The Netherlands.

Rotation 2: Arrrived in Belgium and departed through Belgium.

Rotation 3: Arrived in The Netherlands. Reported to leave through Eindhoven / Rotterdam.

Rotation 4: Arrived in Belgium.

Rotation 5:

Note: the exact composition of its Blackhawks (UH-60L, UH-60M and HH-60M) is unknown. Until rotatin four all medical companies had 15 HH-60M's assigned.

More information related to the Combat Aviation Brigades rotations:

10th Combat Aviation Brigade OAR 2017

4th Combat Aviation Brigade OAR 2018
Photo gallery OAR rotation 3
CH-47 assigned to B/2-4 GSAB. Eindhoven June 22, 2018. CH-47 assigned to B/2-4 GSAB. Eindhoven June 22, 2018. UH-60L assigned to A/2-4 GSAB. Eindhoven June 22, 2018.
UH-60M assigned to 3-4 AHB.
Eindhoven June 22, 2018.
UH-60L assigned to A/2-4 GSAB. Eindhoven June 22, 2018. HH-60M assigned to C/2-4 GSAB. Eindhoven June 22, 2018.
Photo gallery OAR rotation 1
UH-60L assigned to A3-10 AHB Eindhoven October 25, 2017. CH-47F assigned to B3-10 GSAB Eindhoven October 25, 2017. HH-60M assigned to C3-10 GSAB Eindhoven October 25, 2017.
AH-64D assigned to 1-501 AVN Eindhoven October 25, 2017.