An American-led intervention in Iraq started on 15 June 2014, when President Barack Obama ordered US forces to be dispatched to the region, in response to offensives in Iraq conducted by the Islamic State of Iraq and the Levant (ISIL). American troops went, at the invitation of the Iraqi Government, to assess Iraqi forces and the threat posed by ISIL. In early August 2014, ISIL attacked Kurdish-held territory in northern Iraq, and captured three towns in northern Iraq, close to the autonomous region Iraqi Kurdistan. Consequently, the US started supplying the Iraqi Kurdish peshmerga forces with weapons on 5 August. On 7 August, the US also started humanitarian aid air droppings of food, water, and medicine for the civilians fleeing ISIL in the Sinjar Mountains. On the next day, 8 August, the US began airstrikes against ISIL positions in Iraq. Since then, nine countries, allied with the US in some coalition, have also executed airstrikes on ISIL in Iraq, more or less in concert with ground warfare of Kurdish and/or Iraqi government forces against ISIL. There have also been sporadic clashes between ISIL fighters, and US and Canadian troops, several thousand of whom are acting in advisory and combat roles with Iraqi and Kurdish forces.[105][106] By April 2015, ISIL had lost 25–30% of the maximum territory they had gained in Iraq in December 2014, to Iraqi and American-led Coalition forces, leaving them in possession of around 15,000 square miles of Iraq.

It's the old system to number the ODA and ODB (in application during the beginning of OEF and OIF) :

The first number refer to Group - Ex.: ODA 525 

• "0" refers to 10 Special Forces Group (example : ODA 074,...). 
• "1" refers to 1st Special Forces Group (example : ODA 172,...)
• "3" refers to 3rd Special Forces Group (example : ODA 373,...)
• "5" refers to 5th Special forces Group (examples : ODA 525, ODA 555,...)
• "7" refers to 7th Special Forces Group (example : ODA 774,...)

- second is a combination between Battalion & Company (see below) - Ex. : ODA 525 

• ////////Alpha ////////// Bravo /////////// Charlie [= Company]
• 1 = 1st Battalion / 2 = 1st Battalion / 3 =1st Battalion 
• 4 =2nd Battalion / 5 =2 nd Battalion / 6 =2nd Battalion 
• 7 = 3rd Battalion / 8 = 3rd Battalion / 9=3rd Battalion

- third number is Team - Ex. : ODA 525

• 0 = ODB
• 1 = team 1 (ODA)
• 2 = team 2 (ODA)
• 3 = team 3 (ODA)
• 4 = team 4 (halo capabilities - ODA)
• 5 = team 5 (scuba/combat diver capabilites - ODA). 

And at this point, you can also differentiate ODA and ODB : 

• ODA = Operational Detachment Alpha / A-team. It's the basic SF unit.
• ODB (= Operational Detachment beta /B Detachment / B team / SFOD-B ) : it's SF company headquarters. For ODB, the last number is always "0"
• ODC = provides command and control, and staff planning and supervision for SF battalion operations and administration.[107]

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