CQC is also done by Guardsmen, against reasonable opponents (Tau), or by Deamons, or Raging Maniacs (BLOOD FOR THE BLOOD GOD!!! SKULLS FOR THE SKULL THRONE!!! BURN, MAIM, KILL!!!)
"Don't Panic! Keep Shooting!" is trademarked by the Imperial Guard... They now owe the Guards Royalties, as well as a Squad of Guardians to stand on the firing line for the next battle the Guard has in sector. This is all null and void if the Craftworld does not survive this invasion however
See what seperates the humans from the Aliens, is that we don't notice the loss of life, while the Aliens feel it hard. Humans in the 40K universe have the numbers to absorb it. On top of that, we're willing to throw our lives away to protect others. Those 2 factors are why the Imperium still stands despite all their enemies efforts.