This volume is the latest in a series of biennial assessments of the scientific and technical quality of the Army Research Laboratory (ARL). The current report summarizes findings for the 2007-2008 period, during which 95 volunteer experts in fields of science and engineering participated in the following activities: visiting ARL annually, receiving formal presentations of technical work, examining facilities, engaging in technical discussions with ARL staff, and reviewing ARL technical materials. The overall quality of ARL's technical staff and their work continues to be impressive, as well as the relevance of their work to Army needs. ARL continues to exhibit a clear, passionate concern for the end user of its technology--the soldier in the field. While two directorates have large program-support missions, there is considerable customer-support work across the directorates, which universally demonstrate mindfulness of the importance of transitioning technology to support immediate and near-term Army needs. ARL staff also continue to expand their involvement with the wider scientific and engineering community. This involvement includes monitoring relevant developments elsewhere, engaging in significant collaborative work (including the Collaborative Technology Alliances), and sharing work through peer reviews. In general, ARL is working very well within an appropriate research and development niche and has been demonstrating significant accomplishments.