physics

USNS Coastal Sentry

USNS Coastal Sentry is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand USNS Coastal Sentry rather than just read about it. In short: USS Somerset (AK-212) was an Alamosa-class cargo ship that was constructed for the US Navy during the closing period of World War II. She was later acquired by the US Army in 1946 and the US Air Force in 1957 before being reacquired by the USN as the USNS Coastal Sentry (T-AGM-15), a missile range instrumentation ship.

Key takeaways

USNS Coastal Sentry belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect USNS Coastal Sentry to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of USNS Coastal Sentry from memory before moving on to harder problems.

Reference excerpt

USS Somerset (AK-212) was an Alamosa-class cargo ship that was constructed for the US Navy during the closing period of World War II. She was later acquired by the US Army in 1946 and the US Air Force in 1957 before being reacquired by the USN as the USNS Coastal Sentry (T-AGM-15), a missile range instrumentation ship.

Construction The third ship to be so named by the Navy, Somerset was laid down on 9 October 1944, under US Maritime Commission (MARCOM) contract, MC hull 2166, by the Leathem D. Smith Shipbuilding Company, Sturgeon Bay, Wisconsin; launched on 21 January 1945; sponsored by Mrs. Fred Bradley, wife of the Michigan congressman. Initially earmarked to be crewed by the US Coast Guard, Somerset was completed at her building yard on 19 February 1945. After she successfully completed her MARCOM acceptance trials, a Navy sub-board of inspection and survey recommended preliminary acceptance on 22 February 1945.

US Navy service Broken-down for the voyage via inland waterways, the ship arrived at New Orleans, Louisiana, on 2 May 1945, to be transferred to Pendleton Shipyards at New Orleans for reassembly. Accepted by the Navy on 20 September 1945 within a month of the Japanese surrender, Somerset began the conversion process to a cargo ship on 24 September. Ironically, her prospective commanding officer reported on 28 September that progress of the work was proceeding satisfactorily and that crew deficiencies caused by demobilization had been corrected, when, that same day, 28 September, the ship was earmarked for return to the MARCOM. Her assignment to the US Pacific Fleet was cancelled on 29 September. Her estimated commissioning date had been 15 October. Redelivered to the War Shipping Administration (WSA) at 1500 on 2 November 1945, Somerset was stricken from the Navy Register on 5 December 1945 never having been commissioned.

War Shipping Administration On the same day the WSA received the cargo vessel, renamed Coastal Sentry, that agency transferred her to the Stockard Steamship Company at New Orleans. Transferred again, to the War Department, on 2 August 1946 at Baltimore, Maryland., the ship entered the Reserve Fleet, berthed at Suisun Bay, California, on 28 September 1949, with the US Army retaining her title. On 12 December 1949, however, Coastal Sentry was declared surplus.

Merchant service The ship resumed commercial operation under the house flag of the Matson Navigation Company on 15 November 1951. Returned to the Reserve Fleet, this time at Astoria, Oregon, on 17 February 1954, Coastal Sentry was taken out of reserve status on 10 May 1955 to be operated by the West Coast Trans-Oceanic Steamship Line for the Military Sea Transportation Service (MSTS). Another stint of inactivity followed, 19 October 1955 – 22 May 1956, after which she again served under MSTS, this time with the Coastwise Line.

US Air Force service Placed in reserve at Olympia, Washington, on 28 September 1956, Coastal Sentry was taken out of the Reserve Fleet on 29 March 1957. Retaining her name, she was operated by the US Air Force as a missile range instrumentation ship (AGM). Reacquired by the Navy on 1 July 1964 and reinstated on the Naval Vessel Register, Coastal Sentry was designated as T-AGM 15.

NASA service Along with Rose Knot, Coastal Sentry not only collected and relayed radio telemetry information from on board spacecraft, but operated in the command-control role, having embarked National Aeronautics and Space Administration (NASA) flight controllers. As an example of that work, Coastal Sentry initiated the necessary re-entry command signals on the Gemini VIII mission when the capsule had to make an emergency landing in the Pacific on 17 March 1966. For the Gemini Program, she served as a primary tracking station, call sign CSQ, in the western Pacific. Transferred to the Maritime Administration (the successor of MARCOM) on 11 July 1968, the ship was delivered the same day to Fuji Marden and Co of Hong Kong, British Crown Colony, at Fremantle, Australia, for scrapping. Coastal Sentry was stricken from the Naval Vessel Register on 9 October 1969.

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Illustrations

Worked examples

Example 1 — a first encounter with USNS Coastal Sentry

Start with the simplest possible case. Write down what USNS Coastal Sentry claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to USNS Coastal Sentry before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about USNS Coastal Sentry ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of USNS Coastal Sentry

In research: USNS Coastal Sentry appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses USNS Coastal Sentry in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: USNS Coastal Sentry is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1945 ships, Alamosa-class cargo ships, Cold War auxiliary ships of the United States, so understanding it makes those chapters shorter.
In everyday life: Look for USNS Coastal Sentry outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study USNS Coastal Sentry in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what USNS Coastal Sentry means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain USNS Coastal Sentry out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is USNS Coastal Sentry in simple terms?

Why does USNS Coastal Sentry matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study USNS Coastal Sentry?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on USNS Coastal Sentry.