Citreon
The answer is Citroen, a French car manufacturer. The logo first originated with Andre Citroen's discovery of a chevron-shaped gear with helical teeth used in milling to produce an axial force. Adding the second gear in opposition, the force is cancelled. The two chevrons on the logo represent the intermeshing contact of the two.
Citroen
Citroën's logo has 2 chevrons, depending on what you call "bars" (vertical, horizontal, diagonal?) More context would help.
Corporal
Citroen
Citroen
the silver
They are chevrons and you get them according to how many times you have been a member
Citroen
Glyde
The logo described is likely that of the band Metallica, which features a silver circle with a silver lightning bolt.
The company that has a blue hexagon with a silver spade as their logo is Piaggio.