Standardized by the DEA, ATF, and FBI SWAT, the EOTech Holographic Sight Model 552 is by far the most popular HWS model. This night vision compatible, AA battery model is the sight of choice by military units like Stryker Brigade, 10th Mountain, and 3rd Infantry. The 552 is battle proven to withstand the abuse of any harsh environment, high powered weapon platform, or military mission.