U.S. Army's divisional colors are dark blue on the bottom, not black. See: https://commons.wikimedia.org/wiki/File:Flag_of_the_United_States_Army_1st_Infantry_Division
One blackflag with an orange disc (see w:en:Formula One regulations#Flags) Dimensions: 60cm×80cm; disc is 40cm in diameter Black: Pantone BlackC Orange: