GLaDOS didn't really like Atlas and P-Body. They were useful tools, but they were useless for testing. She got some Human test subjects, but they were running out fast. So she sent a Probe up to see how many humans she could take without disturbing their eco-system. When she got the Probe back, it was riddled with gun holes and laser burns. So she searched its memory, and found that the humans were at war. Some Alien Dictatorship had invaded, and the Human Resistance had allied with an enslaved Alien Race to fight them.
The Vortigaunts were unheard of by her, so she needed to catch some. Also, the Humans were losing the war badly, so she needed to assist them so they didn't go extinct, catch a few groups of humans for testing, and also get a few "Face-Spiders" so she could test them, and maybe even use them in a few of her tests. So she decided to send a few Robots out into the real world.
She decided to send the top six of her Android Co-operative Teams, including Atlas and P-Body on a small Training Mission to learn about firearms and battle tactics, engineered two platoons of walking Turrets as well as one platoon of Sentry Turrets and a squad of Frankenturrets to use as Mobile Covers, and she even dug up some old plans for an Assault bot, and made six prototypes of them: Titan, Search and Destroy Assault Bot, or SaDAB, Vulcan, War and Conflict Analysing Droid, or WaCAD, Recon and Scouting Android, or RaSA, and Road Rage. Then she armed them with Portal Guns and firearms of their choice, ranging from AK-47's, M16's, SPAS Shotguns and Desert Eagles, all from the Aperture Science Security Armoury. So she sent up the small army up along with four Reassembly Machines to get the Test Subjects.
The Aperture Army were assembled a few miles north of any Resistance or Combine Movement in the middle of a large Wheat-field, and took Inventory. Atlas and P-Body and Royal and V-TO, two Co-Operative Teams, set up the Sentry Turrets to defend the Base site, with a group of Recharging Pods in the north, Turret Ammo Stockpiles and Battery Stockpiles to the west, Reassembly Machines to the east and a Command Tent with a built-in Armoury in the south. The Command Tent held a large Holographic Map with 3D Cities and Virtual Armies, and a Small Personality Core which was occupied by GLaDOS, who looked to them for updates.
Atlas grabbed a SPAS-12 Shotgun, and P-Body grabbed an AK-47, as well as their Aperture Science Handheld Portal Devices. They charged up, and fixed the generators, which were Solar, Gasoline and Potato Battery, before getting their orders from GLaDOS: They were to march south and meet up with the resistance.
