United States Army Materiel Command. The U.S. Army Materiel Command (AMC) is the primary provider of materiel to the United States Army. The Command's mission includes the research & development of weapons systems as well as maintenance and parts distribution.
A comet is a small, icy object that orbits the sun and has a long tail of gas. Some comets can be seen from Earth every few years, while others pass by once in a person's lifetime. Comets are made of ice, dust, and tiny pieces of rock, but to people on Earth, they look like streaks or smudges across the night sky.
Comets are icy bodies of the solar system. They consist of frozen gas, dust particles and stones or rocks of various sizes from dust size to hundreds of meters. They are distinguished from asteroids by the presence of a coma (the shiny tail).They are of two types.es a nucleus of a comet is made of ice because a comet nuclei are  loose collections of ice, we need to break down the three main  parts of a comet a nucleus, coma, and the â¦ tail.