Secret service trainings and ideas

Contact lenses which will prevent reflection and glare of infrared light at the eyes. -And not damaging for the eyes, also not when infrared light shines on the contact lenses. More camouflaged and stealthed. -People can easily be seen with infrared light in the dark because one or two eyes will glare up. By Jef Koelewijn

Holding in sneezing Holding in cough - Ways to make heavy breath less hard sounding Getting heavy breath under control fast - Extra: -Near no sound yawning -Scratching somewhere makes sound, holding in scratching where there are itchings