The use of hydrogen as a rocket fuel has been successfully established; however, it has also been established that many metals are degraded in one or more of their properties by environmental gaseous hydrogen. The degree of degradation may range from slight to extreme, depending on the metal being analyzed and the type of test or tests used. Many important variables, such as environment, stress, temperature, and time must be considered in selecting the test to be used to determine the susceptibility to gaseous hydrogen. This report will discuss several different types of tests, such as: (1) tensile (smooth and notched), (2) strain-controlled, low-cycle fatigue, (3) high-cycle fatigue, (4) creep-rupture, and (5) fracture toughness, used to determine degradation of specific material properties and enable general observations in regard to the susceptibility of various materials to hydrogen degradation.