Night vision goggles

Nightvision goggles, NVGs for short and also referred to as Nightvision device, are optical instruments that amplifies light to allow personnel to see within dark areas during a mission, usually portable.

History and usage
Nightvision devices were first developed in 1935 in the AEG and formally introduced to the Wehrmacht in 1939. By the end of World War II, they were installed into over fifty Panzer tanks, and a manportable version, the Vampir, was utilized for Strumgewehr 44. America also had parallel systems development of the same technology, installing it onto their M1 and M3s and introduced to the US Army during World War II, although it requires infrared sensors in order for it to be effective.

By 1964, the Soviets managed to develop a portable version that doesn't utilize infrared sensors. Naked Snake procured it during Operation Snake Eater and put it to some use.

During the 1970 San Hieronymo Takeover, the various personnel on San Hieronymo utilized nightvision goggles. Big Boss and his resistance managed to procure and develop some NVGs within their Tech unit.

During the 1974 Peace Walker Incident, Big Boss and his private military group, the Militaires Sans Frontieres, managed to procure design specs on an NVG after taking out the Pupa as well as recruiting Huey Emmerich, after the latter disagreed with Hot Coldman's plans and left out of disgust towards Coldman's plans. This greatly aided the Militaires Sans Frontieres when travelling the Tropical Cloud forests of Central Heredia. In addition, they procured design specs for an SVD that utilizes nightvision technology after aiding some soldiers taking out a tank unit, armored units, defending a key base, or capturing various enemy bases during their missions outside Costa Rica. The KPz 70s that the MSF both fought and captured also utilized nightvision devices.

During the Zanzibar Land Disturbance, Zanzibar Land utilized nightvision goggles during their operations. Solid Snake later procured the device for similar purposes during his mission in Zanzibar Land.

During the Shadow Moses Incident, the Sons of Big Boss utilized nightvision goggles. Solid Snake later procured nightvision goggles for similar purposes when sent to Shadow Moses. Liquid Snake's Hind D also made use of nightvision technology, but the snowstorm prevented him from using it when fighting Snake.

During the Big Shell Incident, Raiden procured some nightvision goggles in Shell 2.

Although nightvision goggles as a whole were discontinued by this point, Solid Snake's Snake Eye device allowed him to see with nightvision.