Colours
The Chapter wears Steel coloured armour and their badge is a black Templars' Cross for most companies. Their companies are numbered and most contain a mix of troop types except the Bretheren of the Sword who wear white armour and have a crimson sword as a company badge.
The Techmarines wear Dark Grey armour with a Bronze Gear on their right shoulder pad.
The Battle Priests (Chaplains) wear Black Armour with an Iron Skull badge.
The Librarians wear silver armour with black trim and black Taboreds.
Apothecaries wear white with red decoration and red Templars' Crosses.
The Use of Older Weapons
Even though the Templars now have access to all of the most modern weapons, they still continue to use the reaper autocannon, havoc missile launcher, thunder hammer for their Dreads, and combi-weapons because they manufacture these on their fortress world and they are very distant from the factories and foundries of the Adeptus Mechanicus and in an area that is subject to periods of isolation due to warp storms. They have also maintained the use of these weapons due to their reliability in the face of the many attacks that they have had to withstand from the forces of Chaos that emerge from the Eye of Terror.
They also equip their tanks slightly differently than do the average Space Marine Chapter. they use sponson mounted reaper autocannons on Predators, and they make heavy use of heavy flamers mounted on attack bikes, etc.. They have also developed a heavy flamer pintel-mount to use on their Rhinos. Also, they use the heavy flamer as a front hull-mount on their Rhinos and Predators fired by the driver.
The Chapter has had to make due in the past with the weapons and equipment available to them with no chance of resupply from the Adeptus Mechanicus and they have adapted their weapons and vehicles to reflect this reality. The Chapter has developed scouting techniques and scout troops that reflect the reality of the guerilla warfare that they were forced to fight during the Age of Apostasy.