Firepower: 0
Cost: 4

Probe Teams can infiltrate and subvert enemy bases and units. They also can steal enemy research information, sabotage base facilities, assassinate key enemy personnel and conduct genetic warfare. The higher a probe team's morale level, the more likely it is to survive increasingly more complex missions.

Keep a Probe Team in your base to defend against Probe attacks. If a probe team is present in a square when an enemy probe team tries to enter, a combat is resolved between them. Usually the probe team with the highest morale level wins.

Probe Teams often receive morale increases when they complete missions successfully.

http://forums.delphi.com/m/main.asp?sigdir=alphacentauri

Firepower: -1
Cost: 10

The Psi Attack weapon allows a conventional unit to make Psi attacks. Weapons and armor are ignored in Psi Combat, and the attacker receives a 3 to 2 advantage on land (1 to 1 at sea).

http://forums.delphi.com/m/main.asp?sigdir=alphacentauri

Firepower: 16

A unit's weapon strength determines its combat strength with which it attacks. The more powerful the weapon the stronger the attack.

http://forums.delphi.com/m/main.asp?sigdir=alphacentauri