The Wings of Coronia (often shortened to WoC) is one of three subfactions of the Foehn Revolt.
Prototypes of the Tarchia Cannon and Harbinger already existed during the Mental Omega War (not to mention, they were battle-ready at this time and proved successful on their first "field test").
As both of these examples were developed by Kanegawa Industries situated in Japan, this suggests that the Japanese branch that followed the Revolt played a large role in developing the Coronian arsenal.