This research investigates the intricacies of motivation and job satisfaction among military service members within the Lebanese Armed Forces (LAF) amidst various challenges. Employing an intrinsic–extrinsic framework, the study adopts a sequential mixed-method design. Interviews were conducted with 42 LAF service members, a Focus Group was convened with 12 LAF subject matter experts, and a survey was administered to 3880 LAF service members across the country. The findings underscore the significance of monetary rewards and praise as primary motivators. Notably, the expectation of rewards emerges as a crucial motivating factor closely linked to job satisfaction, while intrinsic factors exhibit comparatively lesser influence. Salary emerges as the foremost determinant of job satisfaction. Moreover, economic challenges, particularly the drastic decline in purchasing power, serve as a significant moderating factor, adversely impacting the relationship between motivation and job satisfaction. Health challenges, such as the scarcity and increased prices of medical supplies, also exert a negative moderating influence. Conversely, security challenges demonstrate no significant moderating impact. Insights gleaned from the Lebanese context emphasize the importance of offering competitive salaries and recognition programs, ensuring equitable compensation, designing reward systems aligned with performance expectations, regularly reviewing, and adjusting salary structures, providing comprehensive support for employees’ physical and mental well-being, and fostering a secure work environment.