A Lasman's version of the 7 days of Creation
On the first day the God Emperor saw that he need sons to lead his armies so he founded 20 super bad over compensating Primarchs.
On the second day the God Emperor looked and only seeing that he had only 20 warriors founded the Space Marines that are so over compensating with Terminators and Dreadnoughts.
On the third day the Emperor saw that his army looked kind of strange with all males. Seeing this he hurriedly made the Sisters of Battle a group of scary man hating warrior women. Who scare even the Emperor himself why do you think the Space Marines wear cups
On the fourth day the Emperor decided that he needed bigger and tougher soldiers. So thus he made the Titans 100 meter monsters of steel and iron. Has any 1 seen a pattern of something here just saying.
On the fifth day he saw that he needed ships to carry his "huge" army to battle. Thus he made a special group of humans called squids or The Imperial Navy with huge battleships that can stretch from 3 kilometers to large. I am detecting something with the Emperor.
On the sixth day he saw to his shock that he looked very strange with all these super troops. So thus he made us humble men with lasgun and flak armor. We are the backbone of the Empire, The Hammer, The first and the last line of defense, We are the Imperial Guard. Finally he made himself look at bit less strange. With handsome looking dress uniforms and looking like beasts charging down a mountain on horseback or chimeras.
On the seventh day the Emperor looked and saw that everything was good. But to his dismay he saw that in his hurry he had not made himself at set of Imperial Guard Battle Dress. But then he said well everyone can't be as tough and mean as a Guardsman so he kicked back and popped a bottle of beer.
So it was said in the Imperial Creed XXVIII