This research looks at the overall DoD spending for avionics, each of the military service departments overall expenditures for avionics as well as what kind of avionics the services are supporting. The study also looks at the top companies providing products and services in each type of avionics: communications, navigation, identification, mission systems, defensive systems and sensors. Research was conducted in March and April of 2010 and used the DoD and service budget materials from FY2009-FY2011 and the contracts awarded in Fiscal Year (FY) 2009. This information was also used in the forecasting of spending. Values may change as the FY2011 Budget is not final. The U.S. military avionics market continues to grow, but the growth is inconsistent year-to-year. Spending on new aircraft avionics is declining, but the market for avionics modifications continues slow, stable growth. The Department of Defense (DoD) has been consistently spending modification dollars to update legacy aircraft for compliance with global air traffic management (GATM) requirements. However, that spending is nearing the end. Additionally, there has been considerable spending on communications and data capabilities, which are also nearing the completion of that group of modifications. Identification systems comprise the greatest growth segment in the communications, navigation and identification (CNI) traditional sub-segments. However after Mode S and Mode 5 transponder installations are complete, the growth will decline.As part of GATM, US aircraft have been extensively equipped with new GPS systems and small form-factor inertial units. This equipping is drawing to a close. As aircraft have become increasingly computer controlled and connected, military avionics have become more difficult to separate into the traditional sub-segments. Mission systems are the most consistent growth area in military avionics. However, the mission systems are increasingly integrated into the traditional systems and defensive systems. The defensive systems are the highest growth area in avionics. However, growth in the defensive systems subsegment is mostly in the non-traditional technologies. The rest of the defensive systems sub-segment is effectively a flat growth area. This research will examine the overall DoD spending for avionics, each of the military service departments' overall expenditures for avionics, as well as what kind of avionics the services are supporting. This study will also look at the top companies providing products and services in each type of avionics: communications, navigation, identification, mission systems and defensive systems.