duology was an interesting series since while the gameplay looks standard, the presentation is almost cinematic-like since it plays out like war movie about freedom rather than the casualty of war itself. That was the philosophy Okamura went with in order to make the game stand-out amongst other WWII shumups at the time. Funnily enough, Namiki would later contribute to the game's sequel, P-47 Aces
. The original had the cutting-edge YM2151 and OKIM6295 doing the sound for the game. This would become the de-facto chipset for most arcade games for the late 80s to the late 90s. P-47 Aces
uses the YMF271B which was woefully under-utilized in the arcade scene, but it had FM and PCM playback in one chip.
Okamura's interview from Red Bull Music Academy: https://archive.vn/MCwYr
Namiki's interview with SEMO: https://archive.ph/pvJss