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 of Nations are expected to lower their flags to the ground in full and regular salutes in ceremonies and parades. Civilians should stand during such times and soldiers are expected to salute them when not in formation. As the British Army, the Royal Air Force, the Royal Marines and the Royal Navy have several types of colours, there are also colour guards for these colours and these colours and their colour guards are as follows: In the cavalry, the Queen's Standard or Guidon and the Regimental/Squadron Standard or Guidon (for the light cavalry only) are the equivalents to the Queen's