Back ground: First aid is the initial treatment or help given to sick particularly injured individual before professional medical care becomes available with the materials at hand. Such intervention aims in reducing the situations that threaten the victim until a professional arrives or the sick individual is brought to health facility. The first minutes after a serious injury represent only a short time during which potentially lifesaving measures can be initiated. Many deaths from blocked airways or external bleeding can be avoided with quick action such as opening a blocked airway, assisting breathing and applying direct pressure to a wound to reduce bleeding. Objective: to assess knowledge, attitude and practices of military personnel regarding first aid measures. Method: The study site was northern command, 21st division military personnel. Descriptive cross-sectional study design was employed on sample size of 375 military personnel from February 20 - 30, 2014 G.C study period. Results: A total of 375 military personnel‟s, all were males and the response rate was 100%. The mean ± SD age of the study participants was (26.7 ± 7.14) years and with majority rank was Private 162 (43.2%).From the participant 160 (42.7%) attended FA training. Most of them had trained on the military training center. Priorities to respiratory problem causality giving FA 272 (72.5%) have correct answer. Majority knew fractured FA and 365(96.8%) knew one or more than one bleeding control methods. Attitude to first aid was thought to be positive, majority of the respondents were ready to be trained and 312(83.2%) were interest to give FA to others, but 375(48.5%) of them thought that FA could be performed by any person. Conclusion The study participant‟s (military personnel) are expected to know first aid measures more because of their mission. But the result showed that there were gabs on preferable position of unconscious patients, FA of penetrating objects on the abdomen, FA of chemical burn, FA of penetrating eye injury, FA of priority, FA of protruded intestine, seizure, choking, cardiac arrest, fractured. Also half of the participants believed FA activity was performed only by health workers. So it is important to evaluate the first aid training programs of military training center to improve knowledge, practice and attitude of the military personnel‟s regarding basic life support.