 Kọkọ parí gbólóhùn yìí: Lọdún 1917, ẹgbẹ ọmọ ogun yìí di apá kan ẹgbẹ ọmọ ogun abẹlé kejì, wọn sì wà nínú ẹgbẹ náà nígbà Ogun Àgbáyé Kìíní, Ogun Àgbáyé Kejì àti Ogun Kòríà. A ṣe atunṣe bi ọmọ-ogun obi lakoko awọn ọdun 1950 bi Ogun Amẹrika ti ṣe atunṣe eto-iṣẹ rẹ si Ogun Tutu, Battalion 4th rẹ ṣiṣẹ pẹlu Ẹka Ọkọ-ọkọ 25th ni Ogun Vietnam. Àwọn ọmọ ogun 1st, 2nd, àti 3rd ti 9th sìn ní : 19891990 United States invasion of Panama, Operation Just Cause, with the 7th Infantry Division Light. Àwọn ọmọ ogun Amẹríkà wọ Panama, Operation Just Cause, pẹlú Ẹka Ìṣẹgun 7th Infantry Division Light. Awọn ọmọ ogun rẹ 1st ati 4th ja ni Ogun Iraq; 4th Battalion jẹ,, ọmọ ogun nikan ti o ku ti regiment, ti o duro ni Fort Carson pẹlu Ẹgbẹ Ijakadi Brigade 1st Stryker, Ẹka Ọmọ-ogun kẹrin. 