Original vintage 1967 ITT Defense advertisement for their military night vision devices for the U.S. Military, "Guerrilla warfare demands vigilance after dark as well as in daylight.  And for this, you need eyes like a cat.  ITT now provides our armed forces with the same capability as our nocturnal friend - the ability to see in the night.  With this new capability, they even match the cat's incredible mobility."
 
Dimensions: Roughly 8 inches wide by 11 inches high.
 
Night-vision devices (NVDs) (aka night optical/observation devices (NODs) or night-vision goggles (NVGs)), are optoelectronic device that allow visualizations of images in low levels of light, improving the user's night vision.  The devices enhance ambient visible light and converts near-infrared light into visible light which can then be seen by humans - by comparison, viewing of infrared thermal radiation is referred to as thermal imaging and operates in a different section of the infrared spectrum.
 
First used for night combat in World War II, NVDs came into wide use during the Vietnam War and the technology has evolved since then, involving "generations" of night-vision equipment with performance increases and price reductions.  Consequently, though they are commonly used by military and law enforcement agencies, night vision devices are available to civilian users for applications including aviation, driving, and demining.
 
A night vision device usually consists of an image intensifier tube, a protective housing, and an optional mounting system.  Many NVDs also include a protective sacrificial lens, mounted over the front/objective lens to prevent damage by environmental hazards, while some incorporate telescopic lenses.  An NVD image is typically monochrome green, as green was considered to be the easiest color to see for prolonged periods in the dark. Night vision devices may be passive, relying solely on ambient light, or may be active, using an IR (infrared) illuminator.
 
Night vision devices may also be handheld or attach to helmets, but when used with firearms, an IR laser sight is often mounted to the weapon.  The laser sight produces an infrared beam that is visible only through an NVD and aids with aiming. These can be used in conjunction with weapon sights or standalone; some thermal weapon sights have been designed to provide similar capabilities.
 
Currently, the PVS-14 monocular is the most widely used and preferred night vision device across NATO forces, and is widely used by the U.S. Army, and is known for its low cost and wide range of uses and modification ability.  Some higher end devices including the PVS-31 binocular and GPNVG-18 quad-tube night vision are used by special forces groups, but are costly.  Monoculars are generally preferred by advanced military forces.
 
ITT Defense
ITT Inc., formerly ITT Corporation (and ITT Defense), is an American worldwide manufacturing company based in Stamford, Connecticut.  The company produces specialty components for the aerospace, transportation, energy and industrial markets. ITT's three businesses include Industrial Process, Motion Technologies, and Connect and Control Technologies.
 
ITT has over 10,000 employees in more than 35 countries and serves customers in more than 100 countries. The company's long-standing brands include Goulds Pumps, Cannon connectors, KONI shock absorbers and Enidine energy absorption components.
 
The company was founded in 1920 as International Telephone & Telegraph. During the 1960s and 1970s, under the leadership of CEO Harold Geneen, the company rose to prominence as the archetypal conglomerate, deriving its growth from hundreds of acquisitions in diversified industries.
 
In 2011, ITT spun off its defense businesses into a company named Exelis (now part of L3Harris Technologies), and its water technology business into a company named Xylem Inc. ITT Corporation changed its name to ITT Inc. in 2016.