Squad Composition and Tactics

Assigning roles

Specific roles (such as scout, sniper, heavy weapons, psi, etc.) are largely dependent on your soldiers' stats.

Scouts

After securing the landing zone during deployment (making sure all nearby aliens are killed, and establishing a front line), you should expand the secured zone using scouts (see Sweeping the Battlescape). Some commanders prefer using trained scouts (high Reactions and TUs); others prefer cannon fodder (poor stats). Aliens will often shoot from unseen locations, making high stats irrelevant, and even a soldier with terrible stats can take advantage of the mutual surprise rule.

Tanks make excellent scouts due to their high mobility (100 TUs) and relative hardiness. They are also easily replaced, unlike veteran troops. However, in the early part of the game, funds are very limited, and replacing a few rookies is far less expensive than replacing a tank.

The soldiers at the front of the transport must perform scout duties during deployment, which is probably the highest-risk stage of combat. Throwing a Smoke Grenade at the base of the ramp before deploying helps to reduce this risk (do not deploy until Turn 2, after the grenade has detonated). If alien(s) are visible from the front of the transport, they should be killed immediately.

The order on the Soldier screen back at base determines the order of troop placement in the transport. It is unfortunate to have a highly-skilled veteran at the front of the craft, where they are most likely to get killed. One strategy to prevent this is to reserve the first 6-8 soldiers on the list for base defense duty. As your front-most troops gain experience, you can assign these reserves to the transport; they will be placed up front.

XcomUtil can be used to rearrange the order of your troops.

Snipers

Scout/Sniper tactics are among the most effective tactics in the entire game. Although it is desirable to have snipers with high Firing Accuracy, any soldier which can safely fire upon an alien from beyond visual range is a good sniper.

If your squad has a mix of low- and high-power weapons (generally Laser Rifles and Heavy Plasmas), give the best weapons to the troops with the highest Firing Accuracy.

Spotters

One effective tactic is to place several soldiers facing a door (see UFO exit ambush). These soldiers should have high Reactions -- ideally, higher than the Reactions of the aliens they face, although this may not always be possible.

Placing a Smoke Grenade in front of a UFO door can enhance the ambush tactic: if your spotters are 10-15 squares away from door, aliens will not be able to spot them until they have walked through the smoke cloud, using up their TUs and lowering their current Reaction level, making them easy targets.

Heavy weapons

In the early game, heavy weapons duty should be restricted to soldiers that have 40+ Strength. A loaded Rocket Launcher with 3 Heavy Rockets weighs 42 units total (see Encumbrance and Item Weights).

Heavy weapons units are good for clearing terrain and for attacking heavily-armored units such as Cyberdiscs.

In the later game, your heavy weapons units will probably carry Blaster Launchers. Rear Commanders make effective Blaster troops.

Although not strictly a "heavy weapon", equipping two or more soldiers with a Small Launcher during the stage of the game when you are trying to capture an alien Navigator, Leader, or Commander is highly recommended (see Research#The Minimum Three).

Veterans and rookies

The better stats a soldier has, the less danger you will want to expose him or her to. High-ranking soldiers should be left in or near the transport for Morale reasons (see Rear Commander). a Mind Probe or two can be useful in the hands of Rear Commanders. Soldiers with the poorest stats should be given the most dangerous duty: for instance, they should be the first unit sent into a UFO.

Psi soldiers

After Psi-training, any soldiers with high Psi Strength (ideally 80+) should be given a Psi-Amp, and kept off the front lines. Other units can be used to spot aliens, and your Psi units can safely attack them from a distance. Once your Psi troops gain high Psi Skill as well, your squad will become nearly invincible. See Psionics for more details.

Fireteams

There is safety in numbers: soldiers should generally be moved in groups of 2-4. If one soldier spots an alien, the others can act as snipers. Spotting an alien is useless if it kills your scout and you have no troops available to return fire upon the alien.

Tanks

The choice of soldiers vs. HWPs is highly dependent on play style. In the early game, tanks are much more expensive than rookies, and funds are tight. Later on, tanks come into their own as highly-mobile expendable scouts.

If you adopt an all-soldier roster, especially on the Avenger (26 soldiers!), you will have to work around the 80-item limit. This will necessitate the use of Laser Rifles as your primary squad weapon, as they do not require ammo clips.

Armor

In cases where you do not have enough armor for all of your soldiers, the first soldiers to get armor should be the front-line troops: those at the front of the craft, and all scouts. Additional troops should be armored according to their value in combat. Soldiers with high Reactions are likely to engage in a firefight (particularly if they are used as spotters), and should be armored well.

Although Flying Suits have the highest armor values, a soldier in mid-air is an easy target. Flying soldiers will also fail to benefit from ground-level smoke cover, such as at the base of the transport. Flying Suits may be of greatest benefit to scouts, who need the increased mobility. A mix of Power Suits and Flying Suits is probably best overall for your squad.

Soldier naming strategies

One useful strategy is to rename all your soldiers alphabetically. This allows you to see which soldiers will be placed at the front of the transport (arm them with smoke grenades; arm the second row with heavy weapons). To rename soldiers, click on their names while viewing them via the Soldier screen on base.

Another naming strategy is to add stats to their names. TUs, Reactions, Firing Accuracy, Strength, and Psi Strength are the most useful stats to display in this fashion. Keep in mind that soldiers' names will have to be updated when they gain stats from experience.