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INFO: Full form for PRT is Pivotal Response Training in Military and Defence category
PRT also has other full forms in other categories mentioned below.

INFO: Full form for PRT is Procedural Reaction Time in Military and Defence category
PRT also has other full forms in other categories mentioned below.

A Physical Readiness Test, also known as a Physical Fitness Assessment, or PFA, is conducted by the United States Navy to determine the physical fitness of their sailors.

INFO: Full form for PRT is Physical Readiness Training in Military and Defence category
PRT also has other full forms in other categories mentioned below.

INFO: Full form for PRT is Provincial Reconstruction Team (afghanistan) in Military and Defence category
PRT also has other full forms in other categories mentioned below.

INFO: Full form for RI is Radiation Intensity in Military and Defence category
RI also has other full forms in other categories mentioned below.

Refugees International (RI) is an independent humanitarian organization that advocates for better support for displaced people (including refugees and internally displaced people) and stateless people. It does not accept any United Nations or government funding. Refugees International's advocacy addresses resource needs and policy changes by government and UN agencies that improve conditions for refugees and displaced people. Some notable board members include Queen Noor and Matt Dillon as well as past members as George Soros, Richard Holbrooke, and Sam Waterston. The organization is based in Washington, D.C. RI also has a blog detailing its recent actions.

Sonar (sound navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used for robot navigation, and SODAR (an upward-looking in-air sonar) is used for atmospheric investigations. The term sonar is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as underwater acoustics or hydroacoustics.

The first recorded use of the technique was by Leonardo da Vinci in 1490 who used a tube inserted into the water to detect vessels by ear. It was developed during World War I to counter the growing threat of submarine warfare, with an operational passive sonar system in use by 1918. Modern active sonar systems use an acoustic transducer to generate a sound wave which is reflected from target objects.

INFO: Full form for SNR is Sub-net Relay in Military and Defence category
SNR also has other full forms in other categories mentioned below.

INFO: Full form for TPS is Tungsten Protection System in Military and Defence category
TPS also has other full forms in other categories mentioned below.

There are several test pilot schools around the world, formed after the example of the original Empire Test Pilots' School in the UK with mission to train already experienced pilots and engineers to test new and experimental aircraft (listed below by years of foundation):

INFO: Full form for TPS is Technical Publishing Software in Military and Defence category
TPS also has other full forms in other categories mentioned below.

INFO: Full form for TPS is Thermo Plastic System in Military and Defence category
TPS also has other full forms in other categories mentioned below.

INFO: Full form for TPS is Target Parking South in Military and Defence category
TPS also has other full forms in other categories mentioned below.

The Special Security Office (SSO) is a function within multiple arms of the United States federal government and armed forces with the mission to provide a reliable and secure means to receive and disseminate Sensitive Compartmented Information (SCI) and Special Access Programs (SAP) to authorized recipients in the United States government and military organizations. In the military, they are administered by the National Security Agency or Defense Intelligence Agency depending on the command's mission.

Systematic handling of compartmented information probably is most associated with the Special Liaison Units (SLU) originally for the distribution of British Ultra COMINT. Cleared personnel in these units and the equivalent US Special Security Offices (SSO), usually brought material to indoctrinated recipients, perhaps waited to answer questions, and took back the material. In some large headquarters, there was a special security reading room.

INFO: Full form for SSO is System Staff Officer in Military and Defence category
SSO also has other full forms in other categories mentioned below.