The F-15 Boresight Reference Unit is an optical alignment device that is mounted on the upper right side of the F-15 instrument panel. The BRU works in conjunction with the Joint Helmet-Mounted Cueing System (JHMCS) and allows the Weapon Systems Officer (WSO) to align his or her aiming reticle, projected on the helmet visor, with the aircraft’s targeting sensors. This capability allows both crew members to track and lock on to targets simultaneously, particularly with high off-boresight weapons.
