Fort Concho
Over its 22-year career as a US Army base , Fort Concho housed elements of 15 US Cavalry and Infantry regiments , most prominently the "Buffalo Soldiers" of the 9th and 10th Cavalry and 24th and 25th Infantry regiments . 
<triplet> 10th Cavalry <subj> regiment <obj> instance of <triplet> 25th Infantry <subj> regiment <obj> instance of