- This article is about an in-universe event. For the in-game mission, see Long Day.
Operation One Pair was a battle during the Lighthouse War.
Prior to an unknown larger operation, the Osean Defense Forces required more information regarding the anti-air capabilities of the Erusean base situated in Roca Roja. As the Osean Air Defense Force wanted to minimize casualties of its formal pilots, they opted to utilize one of their penal units instead. Members of Spare Squadron were briefed shortly afterward.
On July 4, 2019, Spare Squadron entered Roca Roja airspace and began destroying Erusean military assets within their base. The squadron—especially Trigger—proved quite effective and Erusea's numbers began to dwindle. Although Spare Squadron was officially barred from utilizing mission logistics earmarked for the conventional follow-up attack, AWACS Bandog authorized mid-mission rearmament. Suffering substantial losses, the Erusean military reinforced the base with squadrons of MQ-99s. The outcome of the battle is currently unknown.