ZSh-5 / Shchel-3UM
The Russian designed Shchel-3UM HMD design is fit to the ZSh-5 series helmet, and is used on the MiG-29 and Su-27 in conjunction with the AA-11 Archer. The HMD/Archer combination gave the MiG-29 and Su-27 a significantly improved close combat capability and quickly became the most widely deployed HMD in the world.
Read more about this topic: Helmet Mounted Display, Major Systems