Read the three small indicator lights below each A, B and D key switch. Green left is first, middle second, right third.
In the Ruka bunker, look below the key switch at consoles A, B and D. Of the three small lights, the green light marks that console’s place in the sequence. Silo C has no launch console.
Read the green-light position at two or three consoles.
Your older accepted and rejected console observations are kept here. They are separate from the green-light solver above.
6 possible orders: A → B → D · A → D → B · B → A → D · B → D → A · D → A → B · D → B → A
Inputs are shared with the inline guide on this device. Photos: mmmrkennedy · game imagery: Activision / Treyarch.