Astra Militarum - Notable Regiments (Militarum Regimentos): The Imperial Guard is as infinite in its variety as the Imperium itself, and the war zones across which it fights are quite literally as numerous as the stars in the sky. Ten thousand standard years of war on such a scale has seen enough valiant heroes pass into darkness that no memorial could successfully commemorate their loss. Individual names are as meaningless in this eternal battle as the oceans of paperwork responsible for sending these soldiers totheir unsung deaths, but the archives of Terra overflow with regiments whose contribution to the Imperial Guard has been considered worthy of permanent record.In the turbulent years following the mass rebellions of the Horus Heresy, the newly raised regiments of the Astra Militarum were eager to prove their loyalty. Such zealous dedication was coupled with a burning desire for revenge against those who had turned Traitor, leading many Loyalist regiments to perform great and glorious deeds. The thunderous charge of the Ritterghast 18th against the Cult of the Emperor Dethroned, the capture of Petrov's Fastnessby three companies of Janiverden Tunnelrats, and the final destruction of Lord Morloth's Chaos Terminator retinue under the guns of eleven thousand Vespertine Guard, all are deeds commemorated upon dust-smothered scrolls of honour.Yet the regiments of past millennia do not hold a monopoly on deeds of legend. During every age of the Imperium, countless worlds have produced companies of men and women who have earned reputations for excellence and heroism. Even today, in the Imperium's darkest hour, there are those regiments who stand above all others in the selfless valour of their deeds. However such regiments earn their name, they are vital assets for any Imperial commander. Their mere presence provides inspiration for their more parochial comrades, and can mean the difference between victory and defeat.With few exceptions, badly mauled Imperial Guard forces are merged to form composite regiments. Where possible, the formations in question are from the same world, as was the case when the Cadian 12th and 78th were merged after the fall of Ice Hive Magnox, forming the 12th/78th Cadian Shock Troops. Sometimes, two very different regiments are combined with unexpected benefits, as happened with the 182nd Catachan and 90th Elysian Drop Troops, the combined regiment named as the 314th Prosan. Despite an initial clash of cultures, the new regiment became expert in airmobile jungle warfare after being issued Valkyries during the Saikong Justification Wars. However, the unthinking sublimation of regimental remnants can prove disastrous. During the liberation of Seraph's Fall, tensions between elements of the Necromundan 86th and Savlar 14th saw their entire regiment dissolve into barbarous internecine warfare after their Commissars were lynched. The rebellion was eventually brutally suppressed by several Cadian regiments, but not before the feuding regiment's running gun-battle blew an entire supply depot sky high.Almost every Militarum Regimentum also has its own armoured, artillery and mechanised infantry regiments, with markings similar to those worn by their foot soldiers.The following section represents a small selection of the more notable forces to have served in the Astra Militarum. For a complete list of all known regiments of the Imperial Guard and its predecessor, the Imperial Army, please see List of Imperial Guard Regiments.