Dark Angels - Battleline Squads: The most numerous and strategically versatile warriors in the Dark Angels Chapter are the Battleline Squads, and they form the backbone of most strike forces. Whatever the particular demands of an engagement, Battleline Squads are equal to the task, flexible enough to aggressively press home an attack or to staunchly hold a defensive position.As set down in the revised Codex Astartes, Dark Angels are organised into three main types of squad: Battleline, Close Support and Fire Support, each trained, armed and equipped to excel at a different tactical battlefield role.The squads are each led by a sergeant, who directs his warriors to flawlessly execute the orders of his superiors, and are sometimes split into five-Astartes sub-units called Combat Squads, so as to provide greater battlefield flexibility. These squads include the following:Intercessor Squad - When planning out the core of a Space Marines Chapter, Roboute Guilliman remembered well the success of single armament squads from the days of the Great Crusade. While the Legions did employ a number of specially equipped squads, the hearts of their fighting phalanxes were formed from massed heavy infantry bearing bolters. Thus, with Guilliman's reworking of the Codex Astartes upon his return came the Intercessor Squads. Here was a centre for any battle line -- a core of warriors that could lay down fire while advancing or equally as well hunker down to hold a vital objective. Such adaptable squads would prove invaluable to any tactician, for they would be able to respond to any of the battle's needs. Each member of an Intercessor Squad carries some variant of a bolt weapon. The standard armament is the Bolt Rifle, a firearm that has a longer range and greater armour penetration than the extant Adeptus Astartes Bolter. The Auto Bolt Rifle exchanges some range and striking power for an increased rate of fire, while Stalker Pattern Bolt Rifles can reach a greater distance and have more penetrating power, but cannot be fired on the move, making those that bear it less mobile. The entire squad is extensively trained in the use of each variant, and can equip themselves as the mission dictates. In addition to their main weapon, each Intercessor also bears a Bolt Pistol, Frag and Krak Grenades. It is common for one or two members of an Intercessor Squad to also carry an auxiliary Grenade Launcher, allowing them to fire their explosives across the battlefield. This loadout allows Intercessor Squads to lay down a punishing amount of firepower that can sweep away all but the most resilient of foes. By the third or fourth deployment in the Stygian war zone, even the most reticent and disapproving of the Dark Angels' Veterans was swayed by the effectiveness and sheer killing power of these new squads, but it was the Intercessors' almost innate ability to coordinate between themselves to create overlapping fields of fire that won over many of the brethren. Since the inclusion of Intercessor Squads, the Company Masters of the Unforgiven Chapters have come to count on their formidable salvoes of firepower. Indeed, they are now often the base upon which the rest of a strike force is built.Heavy Intercessor Squad - A Heavy Intercessor is a Primaris Space Marine who serves on the battleline and are a potent defensive force. Clad in thick Mark X Gravis Power Armour, Heavy Intercessors are used to secure ground already won and are immovable in its defence. Always ready for any sign of enemy counterattack, they stand firm, laying down volleys of heavy fire with their Heavy Bolt Rifles that keep all but the most determined or foolhardy enemies at bay.Tactical Squad - For millennia, the Tactical Squad had formed the backbone of the Dark Angels' armies. This period began with the inception of the Codex Astartes at the tail end of the battles of the Great Scouring, and lasted until nearly the end of the 41st Millennium. Although now Tactical Squads must share their combat role with the Intercessors, they remain a mainstay of many Unforgiven Battle Companies. Tactical Squads are composed of versatile warriors, able and equipped to perform a number of battlefield roles. A Tactical Squad could be asked to hold ground, provide fire support, charge into melee, or perhaps do all during the course of the same battle. Adaptability is the hallmark of Tactical Squads. Whereas other Space Marine squads might be optimised to perform a single task, the flexible Tactical Squad is built around the premise that its role will change based on need -- fluidly switching from offense to defence, from static to mobile, from ranged combat to close assault. The circumstances of a battle will dictate the course of action they should follow. The armament carried by a Tactical Squad is the Boltgun, the standard anti-personnel weapon of choice and bringer of death to the Emperor's enemies since the Great Crusade. As befits its needs, a Tactical Squad will supplement its firepower with more specialised or heavier weaponry -- such as a Flamer to burn foes from cover, or a Plasma Cannon to combat heavily armoured enemies. Every battle-brother is fully trained with the entire arsenal, as such duties are rotated to ensure the various firearm skills remain sharp. Tactical Squads often take to battle within a Rhino or perhaps a Razorback, as these tracked transports better allow for rapid redeployment or the seizure of vital objectives.Infiltrator Squad - A Vanguard Infiltrator is a type of Vanguard Space Marine who is usually part of an Infiltrator Squad. Vanguard Infiltrators are Primaris Space Marines who are responsible for disrupting enemy communications and sabotaging targets of opportunity. Clad in Mark X Phobos Power Armour, the first the enemy sees of Infiltrators is a cascade of choking smog as they hurl a barrage of Smoke Grenades, masking their advance. As the foe peers into the swirling cloud, the Space Marines bring their targets down with disciplined bursts of fire, the augur-scopes of their marksman Bolt Carbines lighting each victim up for the kill. Aside from their weaponry, the most important tool at the Infiltrators' disposal is the Omni-Scrambler. This portable, back-mounted device intercepts wave signals across a broad spectrum, scrambling frequencies and diverting holo-broadcasts to ensure that enemy communiques never reach their intended recipients. Infiltrators are drilled in self-sufficiency and survival techniques, and some squads have their own medicae specialists called Helix Adepts to perform the sacred duty of recovering the gene-seed of fallen brothers.