At a time when the message is “lighter and faster,” the use of composite materials can provide significant advantages in certain military vehicle and weapons system applications.  Components made from metal-matrix composites (MMCs) can impart reduced weight when compared to monolithic metal counterparts; these components can also provide improved properties such as strength and wear resistance, as well as the potential for lower manufacturing costs.  However, the absence of well-documented data on MMCs has been a barrier to their more widespread use in U.S. military systems.  While resources exist that can provide general engineering information to support the consideration of composites for use in military applications, specific data on performance, manufacturability, reliability, and life-cycle costs must be gathered with respect to the specific end-use application.  This paper presents and discusses data from the corrosion testing of a prototype steering arm made from two MMC materials, with the goal of eventually replacing the monolithic metal version of this component with the MMCs. military systems.  While resources exist that can provide general engineering information to support the consideration of composites for use in military applications, specific data on performance, manufacturability, reliability, and life-cycle costs must be gathered with respect to the specific end-use application.  This paper presents and discusses data from the corrosion testing of a prototype steering arm made from two MMC materials, with the goal of eventually replacing the monolithic metal version of this component with the MMCs.