Fallout Tactics combat Fallout Tactics combat is more complicated than combat in Fallout and Fallout 2 . The basic combat mechanics are similar , but there are some serious differences . features three modes of combat : " Continuous Turn - Based ( CTB ) " , " Individual Turn - Based ( ITB ) " , and " Squad Turn - Based ( STB ) " . In CTB , everyone can act at the same time , and Action Points are regenerated at a rate based on Agility . ITB is the system used in the original games . STB is a variation of that ; each turn is given to a squad . Other changes include the ability to change " stance " , modifiers for height , and setting " sentry modes " , which let characters shoot automatically in CTB upon encountering an enemy . Combat modes . Continuous Turn - Based mode . CTB is the default game mode . In this mode , all players and characters can act at the same time . Walking and Running do not cost action points , but all other actions do . Action points regenerate over time . Characters with more APs will regenerate them faster than characters with less action points . Individual Turn - Based mode . ITB is the game mode most like the previous Fallout games . All characters will move one at a time , based on their sequence statistic . Characters may not move out of order , with the exception of the " delay action " command , which will move a character farther down the sequence list . Once every character has had a chance to move , all characters will regain all action points and the turn will start over from the top of the list . Squad Turn - Based mode . STB is a variant of ITB . In this mode , all characters for a particular player will get a chance to move at the same time . When all characters in the squad have moved , the next player or the computer will get a chance to act . When all squads have moved , the turn will start over from the top with the first squad . ITB and STB are collectively called " Turn - Based mode " , or " TB " . Stance . There are three different stances : stand , crouch and prone . Characters in lower stance shoot more accurately , are harder to hit and sneak more effectively . They can also use low objects as cover . Crouching sniper can be almost invulnerable when using a high ground . On the other hand , characters in lower stance move slower than those in higher stance . Melee and unarmed attacks can ' t be done in prone stance . Characters that attacking from a very close range against a prone target , are more likely to do critical hits . Sentry mode . The game allows to assign sentry mode to each of squad members to manage his / her default behavior in CTB upon encountering an enemy . There are three different sentry modes - " off " , " defensive " and " aggressive " . Sentry mode off : The character will ignore any enemy activity until receives new commands from player . Sentry mode defensive : The character will alert you when an enemy is spotted by flashing their character tab . If this character is fired on , they will return fire . Sentry mode aggressive : This character will actively fire on the enemy . Characters on sentry mode will not fire if their chance to hit is lesser than the preset value . The possible values are : 95 % ( only fire if you ’ re almost assured of hitting ) , 66 % ( fire under good conditions ) , 33 % ( fire under possible conditions ) and 1 % . Vehicle combat . Fallout Tactics features many vehicles that can be occasionally used as a support in combat . While staying inside a vehicle squad members are protected from enemy fire by its armor and can shoot enemies ( Gunner perk adds 10 % chance to hit when firing from a moving vehicle ) . Vehicle can be then repaired using Repair kit s and Repair skill . If a vehicle takes too much damage , it will become irreparable . The character with the highest Pilot skill becomes a " driver " . He / she then can drive with effectiveness depending on his / her skill ( Lead Foot perk adds 25 % speed ) . Driver can ' t shoot while driving unless the Road Warrior perk is picked but can drive the vehicle to hit enemies and knock them down causing damage . One vehicle in the game , Tank , has it ' s own 75mm Tank gun . The character with the highest Big Guns skill becomes a " gunner " and can shoot tank gun which is added to his / her weapon slot .