They can be spawned in one of 2 locations:
Room 136
Room 85
Chaos Soldier / 200HP
Clearance Level: 5
Cost: $100
Damage: 25 x 5
Chaos Medic / 225HP
Clearance Level: 5
Cost: $300
Damage: 10 x 5
(Can heal teammates and D-Class)
Chaos Saboteur / 125HP
Clearance Level: 5
Cost: $500
Damage: 100
(Can cause malfunctions)