Tuhia tētahi tohutoro mō tēnei whārangi - I whakawhiwhia ia ki te tūranga tuarua hei tuarua i te Rōpū Kaitautoko o te Ope Taua o te Hononga o Amerika i te rā kotahi o tana tohu. I muri mai ka mahi a Irwin ki te hoia eke hoiho i te Pancho Villa Expedition
, i whakahaua e Brigadier General John J. Pershing, hei mema o te 11th Cavalry Regiment i te tau 1916 me te tau e whai ake nei.