The Army Reserves are federal military units focused on providing support in times of war or national emergency, while the National Guard serves dual state and federal roles, assisting in domestic emergencies and overseas deployments.
Key Takeaways
- The Army Reserve is a federal military force that serves as a supplementary component of the active-duty Army, providing trained soldiers and units for domestic and international missions during times of need.
- The National Guard is a state-level military force that operates under the dual control of state governors and the federal government and is responsible for domestic emergency response and overseas combat missions.
- The main distinction between the Army Reserve and the National Guard is their command structure and primary responsibilities. The Army Reserve is a federal force focused on supporting the active Army. At the same time, the National Guard has both state and federal responsibilities, addressing domestic emergencies and participating in combat operations.
Army Reserves vs National Guard
The Army Reserves are a federal reserve force responsible for providing trained units and individuals to augment active-duty forces in times of war or national emergency. The National Guard is a state military force that can be activated by the governor or by the president for national emergencies.

Comparison Table
Feature | Army Reserves | National Guard |
---|---|---|
Primary Affiliation | Federal government | Dual affiliation: State and federal government |
Chain of Command | Primarily under the President | Usually under state governors, but can be federalized by the President |
Deployment Frequency | Primarily for federal missions overseas | Primarily for state missions (e.g., natural disasters, civil unrest), but also deploy overseas and can be federalized |
Training | One weekend per month and two weeks per year | One weekend per month and two weeks per year, plus additional state training depending on mission |
Benefits | Same as active duty soldiers (e.g., health insurance, retirement) | Similar to active duty, but prorated based on time served |
Eligibility | Must meet citizenship, age, and medical requirements | Same as above, plus residency in a specific state |
Activation Length | Up to five years, depending on deployment and needs | Up to two years federally, plus state activation length |
Prior Military Service | Can join with or without prior experience | Same as above |
Size | Approximately 200,000 soldiers | Approximately 450,000 soldiers |
Focus | More specialized units based on federal needs | Broader range of units, including disaster response and civil support |
Community Integration | Smaller presence in local communities | More integrated into local communities due to dual state role |
What are Army Reserves?
The Army Reserves are a vital component of the United States Army, composed of part-time soldiers who serve alongside their civilian careers. Established in 1908 as the Medical Reserve Corps and later expanded, the Army Reserves now encompass a wide range of occupational specialties, including combat arms, combat support, and combat service support roles.
Reservists train one weekend per month and participate in annual training exercises lasting up to two weeks. They are subject to mobilization and deployment during times of war or national emergency, providing crucial support to active-duty forces.
Additionally, they play essential roles in homeland defense, disaster relief, and humanitarian missions, serving as a strategic reserve force ready to augment the active-duty Army when needed. Reservists receive similar training and benefits as their active-duty counterparts and contribute their specialized civilian skills to military operations.

What is National Guard?
The National Guard is a unique component of the United States military with a dual state and federal mission. It traces its roots back to colonial militias and has evolved into a modern force with a diverse set of responsibilities.
At the state level, National Guard units are under the command of the governor and are primarily tasked with supporting domestic operations, such as responding to natural disasters, civil unrest, and other emergencies. This state mission allows the National Guard to provide rapid and robust assistance to local communities during times of crisis.
On the federal level, the National Guard serves as a vital component of the U.S. military, complementing the active-duty forces in various roles. National Guard units can be deployed overseas alongside regular military units, participating in combat operations, peacekeeping missions, and other international endeavors.
This dual nature of the National Guard allows it to fulfill a wide range of roles, from supporting local communities during disasters to contributing to national defense efforts both at home and abroad. It embodies the concept of the citizen-soldier, as its members serve part-time, balancing military duties with civilian careers and responsibilities.

Main Differences Between Army Reserves and National Guard
- Chain of Command:
- Army Reserves fall under federal jurisdiction and are commanded by the President of the United States through the Secretary of Defense.
- National Guard units are commanded by the state governor during peacetime and can be federalized by the President during times of national need.
- Mission Focus:
- Army Reserves primarily focus on providing support in times of war or national emergency, deploying overseas to augment active-duty forces.
- National Guard units have a dual mission, serving both state and federal roles. They assist in domestic emergencies and can also be deployed overseas for combat operations or peacekeeping missions.
- Deployment Authority:
- Army Reserves are deployed solely at the discretion of the federal government, for missions abroad.
- National Guard units can be deployed by both state governors and the federal government, allowing for a quicker response to domestic emergencies and the ability to serve overseas.
- Training Commitment:
- Army Reserves require one weekend of training per month and two weeks of annual training, with the possibility of additional deployments.
- National Guard members have similar training requirements but may also participate in state-specific training exercises and respond to state-level emergencies more frequently.
- Accession Process:
- Joining the Army Reserves involves enlisting directly into the federal military system.
- Joining the National Guard involves enlisting or commissioning through the state National Guard, with the option to serve both state and federal missions.
