The UEF ACU was the staple command vehicle for a UEF commander throughout the Infinite War. This ACU was issued as standard to all UEF commanders.
The ACU plays as an important role during combat. Building structures quickly and, when fully upgraded, can be a formidable weapon if used correctly.
ACUs are also very important to protect, the destruction of one, causes a nuclear explosion. So despite its resilency, the commander should always make sure the ACU is well protected. But if core dump is researched, the threat of a nuclear detonation is averted.
Core Dump Technology - Used to prevent your ACU from going nuclear.
Escape Pods - "Pops" the head of the ACU which will fly back to base and allow the player to survive the ACU's destruction. The body can be rebuilt by the Escape Pod back at base.(Or virtually anywhere, though this is unwise.)
The UEF ACU has the most weapon upgrades of the three factions, this allows for survival and function in various combat scenarios and enviroments
When fully upgraded, this ACU can survive four simultaneous nuclear hits and can leave with enough health to return to fighting.
This ACU can be effectively used as an offensive unit, if escorted with fair amounts AA it is equivalent to a small army.
The radar jammer and jump jets can be fully utilized by guerilla tactics, the radar jammer masks the ACU's presence on apporach and jump jets allow for an escape.
On several maps, there are small islands that are just slightly within ACU jump jet range. One especially effective guerilla tactic is to jump your ACU to the island, build a Noah unit cannon and some basic defense, then jump back to base. On at least 3 maps, a unit cannon placed on these small islands is able to reach locations on the map that would otherwise be out of range, and can allow you to attack the rear flank of the players that aren't directly on the front lines, and thus will often have scarce few defenses to stop you. Note that if this isn't possible, you can always daisy chain the unit cannons, using a Noah in your own base to launch engineers to the islands, but your ACU has jamming, and will probably be more effective.
More effective by far than the old UEF ACU which mainly served as an engineer, defensive support, or if you had the economy to support it, a rapid fire nuclear missle launcher. The new UEF ACU is now the slowest, but most offensively capable of the three ACUs when fully upgraded. However it does poorly when operating alone angainst multiple hostiles, and needs support from other units in order to combat effectively.