The UNSC Behind in Twilight (FFR-002) was a stealth reconnaissance frigate of the UNSC Navy, permanently detached to the UNSC Office of Naval Intelligence, Section One (UNSC Fleet Intelligence) and Section Three. Its hypothetical design was known as WHITE SANDAL, and it would be the product of the academic think tanks RIVER HEDGE and MARBLE COURT, and it would serve as the archetypal prototype and predecessor to the "stealth reconnaissance frigate" (FFR) model of UNSC warships.