The ID Outrider refers to the specialist:
As an orphan on the streets of Rio De Janeiro's Rocinha favela, Alessandra 'Les' Castillo survived on her sharp eye and keen wits.
Given an education in one of the city's international missions, she spent her spare time traversing rooftop to rooftop, watching the people moving in the streets below, noticing patterns and learning how to predict their movements.
After joining the Brazilian Army at 18, her agility and observational skills quickly earned her a place in the "Bda Op Esp", the Special Forces.
Now an advance scout, she stalks the battlefield, tracking down her prey before destroying it with lethal accuracy.
- Alessandra "Outrider" Castillo - callofduty.fandom.com