This unnamed alien race; sometimes referred to as Greys, Chigs, Aquoids, or Landsharks, are a caste-based species who launched a surprise invasion on Earth.
Tactics:
The military doctrine of this species seems to be concentrated on the principles of rapid dominance: using superior maneuverability and firepower to achieve a coordinated and devastating first-strike. This seems to come at the cost of armor protection, relatively speaking, for both infantry and vehicles. The alien vehicles tend to be very maneuverable, but to have exposed positions for their operators. Their battle doctrine seems to be based on the concept of eliminating enemy resistance before it can mount a coordinated retaliation.
Tactics:
The military doctrine of this species seems to be concentrated on the principles of rapid dominance: using superior maneuverability and firepower to achieve a coordinated and devastating first-strike. This seems to come at the cost of armor protection, relatively speaking, for both infantry and vehicles. The alien vehicles tend to be very maneuverable, but to have exposed positions for their operators. Their battle doctrine seems to be based on the concept of eliminating enemy resistance before it can mount a coordinated retaliation.