This mission requires you to infiltrate a small enemy base. The base has several guards, some stationary and some patrolling. Use the surrounding foliage to approach undetected. There's often a vent or a less-guarded entrance on the side or back of the base. Prioritize taking out or avoiding guards near the objective marker.
Inside the base, look for intel files (glowing items) that provide backstory and sometimes unlock new R&D projects. The objective is usually a specific room or a console to interact with. Be mindful of security cameras; shoot them out or sneak past their field of view. Remember to Fulton any valuable recruits you encounter.