The 8th Cavalry or ROTC?

"The most stately building in the Territory," as the old Sierra County Courthouse was once called, stands on the hill behind this military encampment. That dates this photo as post-1892, when courthouse was built. Is this an ROTC camp from New Mexico A&M (present-day NMSU) 70 miles to the south, or is this U.S. Cavalry? The Apache Indian threat was much reduced by the 1890s.  George Albion Miller, who was born in the home behind the tree near the courthouse in 1905, was an engineering student at A&M,was in ROTC, and did own a camera, we know. Photo courtesy Matti and Patti Nunn