Evolution of human colour vision that are found between 450 and 625. Individuals with various forms of colour blindness such as deuteranopia and protanopia are missing human middle wavelength sensitive or long wavelength sensitive opsins. Their minimum wavelength differences are <5 but only at around 500. Protanopes, who are missing long wavelength sensitive cones, are unable to distinguish between colours in the green-yellow-red section of the electromagnetic spectrum. They find yellow, red and orange colours to have much lower brightness when compared to a trichromat. The dimming of these colours can result in confusion in many cases, such as when attempting to identify red traffic
Colour guard Colour guard In military organizations, a colour guard (or "color guard") is a detachment of soldiers assigned to the protection of regimental colours. This duty is so prestigious that the colour is generally carried by a young officer (Ensign), while experienced non-commissioned officers (colour sergeants) are assigned to the protection of the flag. These NCOs, accompanied sometimes by warrant officers (as is the case in several countries), can be ceremonially armed with either sabres or rifles to protect the colour. Colour guards are generally dismounted, but there are also mounted colour guard formations as well. As armies became trained and