... Reactions and Their Implications for Urban Warfare, Santa Monica, Calif.: RAND Corporation, MG-191 -A, 2005. Hoge, C., et al., “Combat Duty in Iraq and Afghanistan, Mental Health Problems, and ... variables actually increase the effect of stress on individual functioning. Research by Green et al. (1990) and Kahana, Harel, and Kahana (1988) suggests that individuals in each of the above-mentioned ... (NSRD) of the RAND Corporation. NSRD conducts research and analysis for the Office of the Secretary of Defense, the Joint Staff, the Unified Commands, the defense agencies, the Department of the...