Caffeine consumption is rampant throughout the U.S. military based on the increase in operational tempo (OPTEMPO), the need to stay alert and to optimize physical performance. Service members are not typically asked about their level of caffeine consumption when they see their primary care managers (PCMs). Caffeine is primarily metabolized by the cytochrome enzyme CYP1A2 that is also the same enzyme that metabolizes some medications that are commonly prescribed to service members. Therefore many service members may not be educated by their PCMs about the potential for drug-drug interactions and the potential for caffeine toxicity. This action research (AR) study is quantitative in nature and collected data obtained from a face-to-face questionnaire to answer five research questions. Three theoretical models were considered to be appropriate for this study: Systems thinking model, density functional theory (DFT) and the health belief model (HBM). There sample size consisted of 100 participants using a convenient sample. There were a total of 100 participants in the study. The prevalence of caffeine consumption among active duty U.S. Army service members assigned or attached to a military medical training facility was 86%. The average amount of caffeine consumed per day among these users was 326.18 milligrams. The prevalence of caffeine consumption and drug-drug interactions (CYP1A2) among these service members was 8% and one Commissioned officer was prescribed a medication that interacted with caffeine and consumed toxic levels of caffeine (1380 mg/d). There was no significant difference found in caffeine consumption between Enlisted and Officers. Six percent reported that they were counseled on the potential of a drug-drug interaction but were not taking any medications listed on the questionnaire. There is also a potential for drug-drug interactions between prescribed pharmaceuticals and caffeine among these services members, although few are being counseled about this risk. This work can help guide policy and program development within the U.S. Armed Forces to help educate and protect its service members.