The National Guard of the United States has been federalized numerous times throughout its history. The exact number of times can vary depending on the criteria used to define federalization (e.g., partial mobilizations, full federalization, etc.) 

Some well-known instances of federalization include:

• World War I

• World War II

• Korean War

• Vietnam War

• Persian Gulf War (1990-1991)

• Operations in Iraq and Afghanistan

The term "Active-Guard Reserve" refers to a specific component within the U.S. National Guard that combines elements of both active-duty service and traditional National Guard service. The Active-Guard Reserve (AGR) program allows National Guard members to serve in a full-time capacity, similar to active-duty military personnel, while still being a part of the National Guard. 

Here's a breakdown of what the term means:

Active-Duty Component: National Guard members in the AGR program serve on a full-time basis, akin to active-duty military personnel. This means they are typically assigned to military installations, have regular work schedules, and are available for duty and missions at any time.

Reserve Component: Despite serving full-time, AGR members are still part of the National Guard, which is considered a reserve component of the U.S. military.

The AGR program began in the early 1970s as a way to address the need for full-time personnel to support National Guard units and missions. Since then, it has evolved and expanded to become an integral part of the National Guard's readiness and operational capabilities. 

Administration: AGR members are managed by the National Guard Bureau and work under the supervision of both state and federal authorities. Their positions are typically critical for maintaining readiness, providing support to traditional National Guard units, and serving as a bridge between the National Guard and the active-duty military.

The Active-Guard Reserve program enhances the National Guard's ability to respond quickly to emergencies, support active-duty military operations.

Dual Role: One of the key features of AGR members is their dual role. They are available to support their respective state's National Guard missions, such as disaster response and relief, as well as federal missions and deployments, such as overseas deployments and military operations. 

This means they can be called upon for state and federal missions just like traditional National Guard members.

Benefits: AGR members receive benefits similar to active-duty personnel, including base pay, housing allowances, and other entitlements. They also have access to the same healthcare and retirement benefits available to active-duty personnel.

Exercises

The National Guard has participated in numerous exercises since at least 2001, aimed at improving readiness, interoperability, and response capabilities. Some of the long-standing exercises include:

1. Vigilant Guard (2001-present): A series of state-level exercises sponsored by the National Guard Bureau and U.S. Northern Command, focused on emergency response and disaster preparedness.

2. Global Guardian (2001-present): An annual exercise that tests the readiness and response capabilities of the Air Force Global Strike Command, including Air National Guard units.

3. Northern Edge (1975-present): A large-scale, joint training exercise conducted in Alaska, involving National Guard units from various states and focusing on air combat operations and interoperability.

4. Cyber Shield (2012-present): An annual exercise designed to assess and improve the National Guard's ability to respond to cyber incidents and protect critical infrastructure.

5. Golden Coyote (1984-present): A multi-state, multi-agency training exercise hosted by the South Dakota National Guard, focused on operational readiness and support to civilian authorities.

6. Foresight (2002-present): A homeland security exercise conducted by the Nebraska National Guard, simulating response to natural disasters and terrorist attacks.

7. Northern Strike (2012-present): A multi-national, multi-service exercise hosted by the Michigan National Guard, focused on joint and coalition force readiness and interoperability.

8. Yama Sakura (1982-present): An annual bilateral command post exercise involving the U.S. Army, U.S. Army National Guard, and the Japan Ground Self-Defense Force.

9. Key Resolve/Foal Eagle (2002-2018): An annual joint and combined field training exercise conducted in South Korea, involving U.S. forces, including National Guard units, and the Republic of Korea Armed Forces. (Renamed as Dong Maeng in 2019)

10. Saber Strike (2010-2020): A U.S. Army Europe-led cooperative training exercise conducted annually in the Baltic states and Poland, involving National Guard units from various states. (Consolidated into DEFENDER-Europe exercise series from 2021)

These exercises demonstrate the long-standing commitment of the National Guard to maintain readiness, build partnerships, and enhance its ability to respond to various domestic and international challenges. The list is not exhaustive, and there are many other exercises conducted at the state, regional, and national levels that involve National Guard participation. The image below from the official X account of the National Guard Burea shares a momentous occasion where they celebrate 30 years of the National Guard's State Partnership program. So, any indication of the National Guard performing anything other than a long-standing program is merely a false claim and using it completely out of context.