US government issue MX-993/U flashlight, which was made to fulfill a contract for the US government by a manufacturing contractor in the United States. This flashlight is completely gray in color and was issued primarily by the US Navy, the US Air Force, and the US Coast Guard. Although I cannot attest to how old this MX-993/U flashlight actually is, it is certainly older than the later-issue MX-993/U’s, because it DOES NOT have a switch guard on it. (This might be an ideal accessory for some of you Vietnam-era military reenactors out there.) The US government issue flashlights which DO HAVE switch guards on them came out at least a few years later. This flashlight is a waterproof design with rubber seals at its top and bottom. Just like the other USGI flashlights, such as the “angle head” model, this flashlight comes with lens filters and a spare PR-6 bulb in a compartment at the base. The length of this flashlight is 9 inches (22.86 cm) and its diameter is 2 1/4 inches ( 5.715 cm). This flashlight is powered by two “D” cell batteries, which are both commercially and widely available. (No batteries are included with this flashlight.) The official nomenclature of this flashlight was “Flashlight, rough service, waterproof” model MX-993/U, Type I, Style 1, Subtype E, without switch guard NSN 6230-00-270-5418. Specification is MIL-F-3747.