This is more about a Space Marine Chapter than the Deathwatch, but the long hand of the Ordo Xenos's Chamber Militant lays across the story.
Tantalus Drumand towered over Damien Exacles from his position a the head of the dais. The silver painted artificer armour enhanced the Chapter Master's physique so that he appeared to be giant compared to his First Captain. Sheathed at the Chapter Master's hip was the power sword Terminus Est, from which the Chapter derived it's name. They were the Sword Bearers and for two thousand years they had struck down the enemies of mankind.
Physically the Chapter Master and the First Captain were much alike. Both hailed from the northern reaches of the Icaru and bore the features that were common in those places. Grey piercing eyes looked out above hawk-like noses and angular faces. Their hair was dark and their skin was a deeply tanned brown and both of them had been fortunate enough to not require augmentic replacements. The left side of Tantalus's face was marred by a terrible acid burn that he had received while serving in the Deathwatch but Damien was fortunate enough not to have received such a disfiguring injury.
"Behold Damien Exacles," the Chapter Master shouted, "Captain of the First Company." Drumand's voice echoed through the long hall, carrying without any mechanical augmentation. The hall's acoustics and the augmented senses of the assembled Astartes meant that not a word was lost even to the men furthest away from the Chapter Master. Eight hundred Space Marines of the Sword Bearers were assembled in two lines facing the aisle and running for almost almost a kilometer in length. Banners and trophies from a hundred different foes hung from the ceiling, swallowed up in darkness. Only the lights at the front of the room were on, although darkness was not a barrier to the vision of the Astartes.
"Take from him his Mark of Mastery!" roared the Chapter Master. Two Marines in silver armour approached the First Captain. The black sword symbol on their right shoulder pad marked them as Sword Bearers, but the stone Crux Terminatus on their left shoulder pads marked them as First Company and worthy of the honor of wearing the rare and potent Terminator Tactical Dreadnought Armour into battle.
They extended their hands and gently took the white cloak from Exacles's shoulders. Hands encased in armoured gloves with deliberate and delicate care unclasp golden sword broach secured the cloak to the First Captain's shoulders and marked him as a master of the blade. Exacles stood as still as a statue.
"Take from him his badges of rank!" roared the Chapter Master. Two more Astartes of the First Company approached their captain. Exacles now wore just the long sleeveless tunic and sandals that were the common garb of the Chapter for both Astartes and serfs. On his brow he wore a crown of laurels carved from jade and set with a synthetic ruby. On his shoulders he wore a small stone badge in the shape of a cross and skull and a gold badge depicting a skull on top of three badges. Around his waist he wore a simple belt of grox hide from which hung a meter long gladius style sword in an intricately worked sheath.
The Astartes delicately removed the badges marking Damien's position as captain and a warrior of the First Company from his shoulders. They then stepped back. "Take from him the mark of glory!" bellowed Tantalus Drumand.
Two more warriors of the First Company stepped forward. The took the crown of laurels from their captain's head and stepped back. Exacles had not yet even blinked. "Take from him the mark of brotherhood!" roared Drumand.
Another pair of warriors came forward and cut the sword from Damien's belt. They resumed their positions as had their brothers before them, holding the honours as carefully as spun glass trophies.
"These are all marks of a Sword Bearer and from today forth you are a Sword Bearer no longer!" roared Drumand "From our ranks I cast you out!"
Damien moved for the first time, raising his gaze to meet that of his former master. "But I am still your brother!" he shouted. "For all that you have done will never been forgotten! All that I have lived, all that we have lived, we will carry with us forever! The old bonds and old ties will never be forgotten!"
"For as long as men endure in this galaxy," replied Drumand, "for as long as Sword Bearers fight in the Emperor's Name you will be remembered! By what name shall you be known?"
Damien Exacles turned away from the Chapter Master and turned to address the assembled Marines. "From this day forward, I and all that shall follow in my footsteps shall be known as the Blood Tigers!"
"Let the enemies of Mankind tremble!" shouted Drumand. "For today the Sword Bearers have given birth to a new chapter of the Angels of Death and from our ranks we haven chosen one of the greatest among us, the Captain of our First Company, to lead it!"