Whakaotihia te rerenga e whai ake nei: I muri mai i whakawhiwhia ia hei tuarua tuarua i te Tari Kaitautoko o te Ope Taua o te United States i te ra ano o tana tohu. I muri mai ka mahi a Irwin ki te hoia eke hoiho i te wā o
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.