Extracted from the 30 Mecha Design Flaws submission. Edited and reconfigured as a setting neutral piece for use in military aspected settings and most if not all flaws can be used on any vehicle or large piece of hardware.

The 228th Mountain Lion battalion faced a situation not entirely unlike General Custer some 500 years before. Like Custer's men, the 228th was almost completely destroyed, despite their laser cannons and drop ships.

All you need to stop a brain is a bullet.

30 generic problems to dole out for homebrew, custom made, and scratch built machines

The walking siege engines of the Cosmic Era

The Rocky Mountain Republic owes in large it's existence to a single limited run of primitive mechs, the Assault/Bombard Mech model 1.

Technology in the Cosmic Era can become corrupted and infested. When this happens to a mecha, the result in codenamed a Hekatonkheire.

The home base of the mighty mech

The reasons that mecha are not reliable as weapons of war are manifold, but the world changed more than many people expected and the way wars are fought have changed greatly since the middle of the Petroleum Era.

A common light mech of the Atlantic Federation

The ultra minimalism mech, for the common consumer

While technically alive, magnagogs have little in the way of personality and are driven via telepathic command.

The Sogans were a mystically aware technological society. Queen Stavarang is the last surviving Sogan in the galaxy

The grinding of gears in the dead of night is a precursor of an unforgiving danger. Survivors remember little, save the smell of metal and death.