3/1 Bravo was a UNSC Marine Corps unit, identified by its IFF tag as an infantry unit. It was in operation in 2552. Members of this unit were involved in a skirmish at Pawas, Pakistan, Earth during the Battle of Earth that year. A team from 3/1 Bravo was assigned to "recover" John-117 by sighting his approach vector as he landed on Earth after arriving on the Forerunner ship. The team, consisting of at least three Marines and a Corpsman, came under heavy attack from a column of Jiralhanae with air support from Banshees and Phantoms, however they were able to successfully hold off the enemy with the help of two ODSTs from Delta Team of 3rd Unit, 2nd Shock Troops Battalion. Though successful, the unit suffered at least one killed and two wounded during the fight.