The PRSG is a voluntary professional military corps and one of the Major Subordinate Commands of the Puerto Rico Military Forces, which includes the Puerto Rico Army National Guard and the
Puerto Rico Air National Guard (PRANG). The PRSG responds directly to the Adjutant General of Puerto Rico, is commanded by a
brigadier general and is composed of main units in the
San Juan metropolitan area and the cities of
Ponce (South),
Mayagüez (West),
Caguas (Center), and
Ceiba (East). The PRSG is among the most active and largest of the country's
state defense forces (SDFs) with almost 1,500 troops organized into six support groups, a separate
SAR company, a military academy, an air base group and HHQs. SDFs (also known as state guards, state military reserves, or state
militias) in the US are military units that operate under the sole authority of a state government and are partially regulated by the
National Guard Bureau. Their constitutional authority is given in Article I, section 8 of the
US Constitution, which endorses the existence and potential value of the army, navy, and militia, and establishes basic roles for federal and state governments with respect to their administration and operation. However, Article I, section 10 of the Constitution prohibits states from maintaining state guards in times of peace, without the express consent of
Congress. Provisions for states to maintain SDFs are outlined in section 109, title 32 of the
United States Code (32 U.S.C. § 109 [2013]). Initially established by Congress in the early 20th century and authorized in their current form in 1955, there are active SDFs in 19 states and Puerto Rico as of February 2024. SDFs are authorized by state and federal law and are under the command of the governor of each state. The US Congress recognized the need for governors and States to keep military troops even if the President calls the state National Guard for federal military service. For that reason, Congress authorizes the SDFs under
Title 32 of the United States Code. as part of a week-long assignment The PRSG is the SDF of Puerto Rico and can support
Puerto Rico National Guard (PRNG) operations in security, engineering, transportation,
chaplaincy, emergency management, legal, and medical services among other operational areas. As part of the PRNG the PRSG is also known as the
State Command of the Puerto Rico National Guard. Along with
Texas,
California and
New York, the PRSG is one of the few SDFs that has an air division. The
1st Air Base Group (1ABG), located at
Muñiz Air National Guard Base, is an example of integration and teamwork with PRANG units, especially the
156th Airlift Wing. The 1ABG is composed of a headquarters squadron, a mission support squadron (engineering flight, services flight, personnel flight, security forces flight and firefighter flight), a medical squadron, and a logistic squadron (transportation flight, supply flight and an aerial port flight). Currently, the 1ABG has two support units for the
141st Air Control Squadron in
Aguadilla and the
140th Air Defense Squadron in Punta Salinas. All 1ABG units are organized to meet the military training requirements necessary to take over PRANG installations upon mobilization and deployment of their units. The 1ABG training is conducted in accordance with
USAF regulations, which supplement PRSG and PRNG regulations, directives and guidance. Unit Training Assemblies (UTAs) are performed jointly with PRANG's 156th Wing in consolidated drills. These drills allow 1ABG personnel to acquire hands-on experience of what their duties would be if PRANG units were mobilized and deployed. It also allows them to be trained by their counterparts in their specialty. ==History==