This paper provides a detailed explanation of new test capabilities developed for and deployed in the Navy CASS (Consolidated Automated Support System) station. The EO3 system is the third generation EOSS (Electro-Optical Sub-System). The second generation EOSS is currently deployed in the Navy CASS and Army IFTE (Integrated Family of Test Equipment) stations. The EO3 performance supports testing middle wave and long wave FLIRs (Forward Looking InfraRed), SWIR (Short Wave InfraRed) cameras, visible cameras, range gated cameras, laser rangefinders, laser designators, laser spot trackers, continuous wave lasers, multi-laser coboresights, and supporting gimbal/tracking systems. Novel techniques are employed to address extremely accurate sensor to laser boresighting in a vibrational environment, 2-dimensional modulation transfer function testing, and multiple laser boresight measurements