Ultramarine with a Flamer
During the Great Crusade, the operational doctrines of the XIII favoured tactical diversity and the application of overwhelming force. As a reflection of this, the Legion maintained relatively few specialised companies I.e. Destroyers, instead choosing to spread those units which maintained large stocks of non-standard equipment and munitions evenly throughout the various companies of the Legion.
It was intended that every Ultramarines company would be individually capable of meeting the enemies of Mankind on any terrain and in any theatre of war with equal ability an emerge victorious, magnifying this power in combination with other chapters almost geometrically. One of many practical applications of the vast storehouse of theoretical battle scenarios, plans and tactical formulae that make up the vast strategic corpus upon which the Ultramarines Legion based its art of war, the "Logos Lectora", or roughly more commonly and imprecisely rendered the "pronouncement of writ" was a battlefield formation which took advantage of an interlocking range of Legion units to their best effect. Reliant on sophisticated command and control protocols, faultless obedience and rigid discipline, if the Logos Lectora had a disadvantage as a tactic, it was that its interlocking units formed a coherent pattern somewhat inflexible in their makeup and deployment.
To this end, after the Legions were broken up into chapters, most of them featured a proportionate mix of tactical and assault units, armour and artillery as well as gunships and transports. Even though there were some Chapters like the Nemesis or Auroran Chapters that specializes in Destroyer or Armoured assault warcraft, majority of the Ultramarines chapters are generic Jack of All Trades well versed in all types of warfare yet masters in none.
A Ultramarine looking for a brawl
Ultramarines are held in the highest regard in the Imperium of Man. Of all the thousand and more Space Marine Chapters, it is the blue-clad Ultramarines that, in the mind of the countless billions of the Emperor's subjects, personify everything that the Adeptus Astartes stands for. The Ultramarines and their many Successor Chapters have stood at the very forefront of the war against the Traitor, the alien, and the fiend since the very foundation of the Imperium. Across the domains of the Emperor, the Ultramarines are celebrated as heroic, virtuous, and noble defenders of Humanity, their deeds recorded in devotional works the length and breadth of the galaxy.
Pic recording of Ultramarines show them as handsome man, square nose, block jaws, noble and honourable but that's not always the case. A human pays a steep price for the transformation into a protector of Mankind, ironically sacrificing much of his own humanity in the process. Appearance wise, they are enlarged, normally blocky in all aspects, blunt nose, blunt face, blunt body. They often carry severe scarring as they can survive injuries that would have killed normal humans and recover from them i.e. lose most of face or a jaw or part of the skull.
As a return for their sacrifice, Astartes are physically stronger, far more resilient and often mentally far removed from the lot of most normal human beings. Space Marines feel little compassion for those they have sometimes termed "mortals" in comparison to themselves, seeing the very people they were created to protect as little more than obstacles to a more efficient eradication of the Imperium's enemies. This is an attitude sometimes taken by whole Chapters. They see normal humans as frail, weak creatures given to the follies of temptation, avarice, greed, lust and cowardice -- all emotions they rarely feel, if ever.