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The '''Solar Auxilia''' was an elite fighting force within the [[Imperialis Auxilia]] during the [[Great Crusade]] and [[Horus Heresy]] originating from the [[Segmentum Solar]]. Of the myriad [[regiment]]s and battalions of the [[Imperialis Auxilia]] (known in [[Low Gothic]] as the [[Imperial Army]]) the Solar Auxilia were amongst the most elite, disciplined and well-equipped fighting forces, widely considered by many second only to the superhuman [[Legiones Astartes]] in their military effectiveness in battle.{{Fn|1}} Solar Auxilia soldiers were only trained as infantrymen but also for space combat, combat engineering, planetary exploration, and [[Death World]] survival missions.{{Fn|2}}  By the second century of the Great Crusade, the Solar Auxilia made up between 20-25% of the Imperial Army.{{Fn|2}} ==History==Originating from the [[Sol System]] from [[human]] drawn from [[Terra]] and [[Saturn]], these troops were the best organized and equipped Imperial Army forces. Their doctrine emphasized discipline, coherence, aggressive defense, and concentrated firepower, making them highly effective soldiers. As the Great Crusade ground on, the Sol System could no longer provide enough manpower for the much-demanded Solar Auxilia forces, so recruits were drawn from elsewhere.{{Fn|2}} During the ensuing Horus Heresy, the Solar Auxilia became a key asset of loyalist forces. One of their most notable campaigns was the [[Battle of the Coronid Deeps]].{{Fn|2}} ==Organization==[[Image:SolarAuxiliaRanks.jpg|thumb|right|Solar Auxilia Ranks]]The base operating unit of the Solar Auxilia on the strategic level was the '''Regiment''', comprising about 5,300 soldiers and staff. However as the Great Crusade expanded in size, much larger '''Solar Cohorts''' were established of 120,000 personnel under the command of a [[General|Marshal Solar]]. These would be broken into a number of sub-cohorts, each with a nominal strength of 1,200 under a Legate Commander, Commander, or Sub-Commander depending on its particular type.{{Fn|2}} On the tactical level, the building block of the Solar Cohort was a '''Terico''', itself made up of three sections whose nature was defined by their weaponry and battlefield role. The most commonly deployed Terico formation consisted of three sections each comprising 20 armored [[Lasrifle]]-equipped troops. Veteran '''Veletaris''' Tericos usually consisted of three squads of ten veteran troops equipped with more advanced short-range weaponry such as the [[Volkite Charger]] or [[Flamer]]. Fire Support Tericos commanded three batteries of crew-served weapons platforms, most commonly the [[Rapier]].{{Fn|2}}  ==Equipment==The most iconic piece of the Solar Auxilia was its [[Solar Pattern Void Armour]], a [[carapace armour|carapace]]-reinforced full environmental combat body suit with fully integrated life support units. The most commonly issued weapon was the '''Kalibrav V-1''' pattern [[Lasrifle]], a higher-quality Laser firearm superior to a standard [[Lasgun]].{{Fn|2}} The Solar Auxilia made use of a wide array of heavy vehicles, most notably the [[Dracosan Armoured Transport]]. The [[Arvus Lighter]] was most frequently used for airborne landing operations. The most common heavy support vehicles were the [[Leman Russ Battle Tank]], [[Malcador Heavy Battle Tank]], [[Basilisk]], and a variety of [[Super Heavy Tank]]s that included the [[Baneblade]], [[Stormhammer]], [[Stormblade]], and [[Shadowsword]].{{Fn|2}} For boarding operations in space, the [[Shark Assault Boat]] was most commonly employed.{{Fn|2}} ==Notable Cohorts==*'''1522nd Solar Auxilia Cohort''' from [[Agathon]]{{Fn|2}}*'''204th Solar Auxilia Cohort''' from the [[Manachean Commonwealth]]{{Fn|2}}*'''142nd Solar Auxilia Cohort''' from [[Cthonia]]{{Fn|2}}