>>280841527
>>280841739
>The war devil A.K.A. Asa Mitaka

The PS and the gov have always known Asa is the War devil. She might be even their 'project' like Control devil. Kishibe giving Control to Denji to raise was because they did that before with War and succeeded.
About why Falling couldn't recognize Asa as War. Simple, War is a devil who gained so much humanity her devil traits became nearly unrecognizable to other devils. Only Nayuta kinda smelled her back then