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Military Service in the USA: Who Can Enlist?

Understand how the American Armed Forces work, the criteria for enlistment, and the participation of immigrants and women.

Written by

Victoria Harper

Editor-in-Chief

Updated on March 4, 2026
6 min read
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Understanding how military service works in the United States is essential to grasp the dynamics that underpin national security and defense. This article provides an updated overview of American military institutions, explaining everything from the structure of the Armed Forces to the criteria for enlistment, with an emphasis on the participation of legalized immigrants and the historical evolution of women’s roles. With ongoing modernization and increased investments, understanding these aspects becomes fundamental for those who wish to delve deeper into the subject.

Over the past decades, the United States has maintained a prominent position on the world stage due to the robust structure of its Armed Forces, which is constantly adapted to face geopolitical and technological challenges. This context not only reinforces internal security but also attracts the attention of citizens and immigrants interested in contributing to national defense, whether through preventive registration or by choosing a military career.

Structure of the Armed Forces

The United States Armed Forces are composed of several branches, each responsible for specific functions that ensure the country’s defense and the maintenance of order. The main branches are the Army, the Marine Corps, the Navy, the Air Force, the Space Force, and the Coast Guard. Each entity has its own duties, but all are interconnected and operate under the leadership of the President, who serves as Commander-in-Chief.

Additionally, the Forces operate under the Department of Defense (DoD) and, when necessary, under the Department of Homeland Security (DHS), ensuring effective coordination between different government spheres. This hierarchical and specialized structure allows the United States to maintain the greatest military power and a broad capacity to respond to emerging threats, backed by significant investments.

In fact, while 2019 data indicated a budget of 693 billion dollars for the Armed Forces, current estimates suggest that by 2026, this amount will have been adjusted to approximately 850 billion dollars. This increase reflects the strategic importance of defense, highlighting the country’s commitment to innovation and the continuous modernization of its military capabilities.

Enlistment and Military Registration

Unlike countries that adopt mandatory military service, the United States uses a preventive registration system, known as the Selective Service. In this system, all men-whether native citizens or legalized immigrants-between the ages of 18 and 25 must register. This procedure does not automatically imply serving in the Armed Forces, but ensures that a labor reserve is available for mobilization if needed in emergencies or conflict situations.

The registration serves as a preparedness and contingency measure, allowing the country to act quickly in the face of crises. Thus, although there is no immediate compulsory enlistment, this regulation is crucial to maintain national readiness and ensure that all eligible individuals can be called upon to contribute to defense, if necessary.

Criteria for Joining a Military Career

For those who wish to turn registration into an active career in the Armed Forces, the requirements are more rigorous. In general, candidates must be between 18 and 35 years old, demonstrate proficiency in English, present a clean criminal record, and possess basic knowledge about the history and values of the United States. Proof of permanent residence is also mandatory, ensuring greater integration of the individual into American society.

These criteria aim to select committed candidates who are able to take on the responsibility of serving in the country’s defense, thus ensuring the effectiveness and cohesion of military operations. The selection process is designed to filter those who, in addition to meeting legal requirements, demonstrate potential for a successful military career aligned with national values.

Participation of Immigrants

Legalized immigrants, including green card holders, have the opportunity to enlist in the Armed Forces, provided they meet all required criteria. Historical data indicate that thousands of immigrants register with the Selective Service and choose to join various military areas each year. Even though they represent approximately 3% of the total force, these individuals enrich the cultural diversity of the Armed Forces and bring experiences that strengthen integration within the military environment.

For many immigrants, the option for military service represents a way to demonstrate commitment to their new homeland, as well as facilitating their social integration. However, it is important to note that only legalized immigrants have this possibility, as those in irregular situations or holding temporary visas cannot enlist.

Historical Evolution and Inclusion of Women

The participation of women in the United States Armed Forces has a rich and constantly evolving history. The first official record of women serving in the military dates back to 1942, when a contingent of nurses was mobilized to meet urgent needs during World War II. Initially, female presence was mostly restricted to the medical and support areas.

In 1948, a presidential decree expanded the possibilities for women to join, although initial opportunities remained limited. Effective transformation began to occur from the 1970s, when women started to occupy positions of greater responsibility and to join the ranks as career officers. Today, their participation is comprehensive, being present in all operational areas, from command to specific roles in combat operations.

Cultural and Social Aspects

Military service goes beyond a career or obligation, also serving as an important agent of integration and social development. The experience of serving in the Armed Forces provides the learning of values such as discipline, patriotism, courage, and responsibility, which are essential both for professional and personal life. For immigrants, this environment can represent a unique opportunity for integration, contributing to a sense of belonging to the new society and to the strengthening of community ties.

The interaction among military personnel from different backgrounds and cultures promotes a dynamic and innovative environment, in which diversity is seen as a strategic asset. This coexistence fosters the development of interpersonal skills and the formation of a solid civic identity, elements that are reflected in the operational effectiveness of the Armed Forces.

Useful Information and Recommendations

Although this article offers a comprehensive overview of military service and enlistment criteria in the United States, it is essential that those interested consult official sources for updated information. Government portals, such as the Department of Defense website and the Selective Service website, are the best references for keeping up with policy changes and budget values.

Potential candidates or those interested in a military career should stay informed about legal and operational requirements, ensuring compliance with all obligations. In this way, registration and eventual entry into the Armed Forces not only ensure compliance with the law, but also provide access to a range of benefits that can contribute to career consolidation and full integration into American society.

In summary, understanding how military service works in the United States and its entry criteria is fundamental for those who wish to join an institution that plays a crucial role in national defense. Whether through preventive registration or by joining a military career, individuals find in this environment the opportunity to contribute to the country’s security, develop valuable skills, and participate in a tradition that values commitment and excellence.

Victoria Harper

Editor-in-Chief

Meet the author

Leading journalism and editorial content at Visto n’ Visa, Victoria helps make immigration topics clear, trustworthy, and easy to understand. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.

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