Crimson Squadron functioned as a Bomber Squadron for the Resistance. Their fleet consisted of MG-100 StarFortress SF-17s. A key moment for them was their involvement in the Evacuation of D'Qar amidst the war between the Resistance and the First Order.
Crimson Squadron played a role in the Atterra campaign, specifically by transporting essential provisions to the Atterra system.
In the course of the evacuation of D'Qar, a pair of bombers from Crimson Squadron received orders to target the Mandator IV-class Siege Dreadnought. This dreadnought was actively targeting the MC85 Star Cruiser known as the Raddus. They fought alongside Cobalt Squadron. Crimson Squadron suffered complete annihilation, but Paige Tico of Cobalt Squadron successfully deployed her payload, resulting in the dreadnought's destruction.
The initial glimpse of Crimson Squadron occurred in the debut teaser trailer for Star Wars: Episode VIII The Last Jedi, unveiled on April 14, 2017. Their designation was officially disclosed on September 8, 2017, via the Fantasy Flight Games online platform.