Multiple EOTech models have National Stock Numbers and are or have been in use by the U.S. military. Also, some units allow soldiers to purchase their own EOTech holo weapon sights.
U.S. Special Operations Command has a contract with EOTech for close-quarters sights and magnifiers. That particular model is the EXPS3. Other models can also be found on non-SOCOM military rifles.
EOTech models used officially by military and law enforcement agencies include the 552, 558, 300 Blackout, XPS2, and EXPS3.