The Emperor's Advisory Committee on Military Affairs advised Emperor Palpatine regarding military affairs around the time of the Battle of Yavin.
At some point, they received a report from senior officers of the Imperial Department of Military Research relating to then-recently implemented custom ordnance for the Imperial Military, including cloaking fields, hyperspace pulsemass generators, magnetic bombards, orbital nightcloaks, visual electromagnetic intensifiers, and two-wave gravshock devices, as well as detailed descriptions of each. A copy of this report was later procured by Major Arhul Hextrophon, the Executive Secretary and Master Historian of the high command of the Rebel Alliance, and submitted alongside other copied Imperial reports in a single report to the High Command, including Alliance Supreme Commander Mon Mothma.