The Close Combat Badge (or CCB) was an approved badge that was never issued. It was quickly scrapped and replaced by the Combat Action Badge

Combat Action Badge

The Combat Action Badge is a military badge worn in the U.S. Army. The emblem features both an M9 bayonet and M67 grenade. The Combat Action Badge may be awarded to any soldier after the date of September 18, 2001 performing duties in an area where hostile fire pay or imminent danger pay is...

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The U.S. Army would have awarded the CCB to Armor, Cavalry, Combat Engineer, and Field Artillery Soldiers

Field artillery

Field artillery is a category of mobile artillery used to support armies in the field. These weapons are specialized for mobility, tactical proficiency, long range, short range and extremely long range target engagement....

 in Military Occupational Specialties. It could also have been awarded to corresponding officer branch/specialties recognized as having a high probability to routinely engage in direct combat, and they must be assigned or attached to an Army

Army

An army An army An army (from Latin arma "arms, weapons" via Old French armée, "armed" (feminine), in the broadest sense, is the land-based military of a nation or state. It may also include other branches of the military such as the air force via means of aviation corps...

 unit of brigade

Brigade

A brigade is a major tactical military formation that is typically composed of two to five battalions, plus supporting elements depending on the era and nationality of a given army and could be perceived as an enlarged/reinforced regiment...

 or below that is purposely organized to routinely conduct close combat operations and engage in direct combat in accordance with existing rules and policy.