computer science

On the roof gang

On the roof gang is a computer science 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 On the roof gang rather than just read about it. In short: The On the Roof Gang (sometimes written On-the-Roof-Gang and abbreviated OTRG) was a group of United States Navy cryptologists and radiomen during World War II who are seen as the forerunners of U.S. Navy cryptology and cryptanalysis.

Key takeaways

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

Reference excerpt

The On the Roof Gang (sometimes written On-the-Roof-Gang and abbreviated OTRG) was a group of United States Navy cryptologists and radiomen during World War II who are seen as the forerunners of U.S. Navy cryptology and cryptanalysis. One hundred fifty Sailors and 26 Marines worked on the roof of the Navy Department building in Washington, D.C. from 1928 to 1941.

History The On the Roof Gang was a school for radiomen and cryptologists who would go on to deploy on ships and to overseas bases and collect foreign signals intelligence (SIGINT) and communications intelligence (COMINT) to monitor the movements and operations, and intercept the message traffic, of foreign navies. In 1928 the Chief of Naval Operations understood that a group of formally trained operators was needed in the Pacific Fleet to monitor Japanese naval communications. There existed a small cadre of self-taught operators in the Pacific theater, and two of them were selected to become instructors in the "On the Roof Gang." Chief Radioman Harry Kidder and Chief Radioman Dorman Chauncey instructed the early classes. Initial graduates were sent to ground stations in the Pacific to monitor the Japanese. Later the cryptologists eventually began to serve on board ships.

Modern Impact Naval Network Warfare Command (NETWARCOM) honors Navy and Marine cryptologists with the "On-the-Roof-Gang" Award. The award recognizes lifetime accomplishments in the field of cryptography. Part of the area formerly occupied by the Naval Building is now home to the Vietnam Memorial.

See also Defense Language Aptitude Battery (The test taken to become a CTI) Defense Language Proficiency Tests (The tests taken to assess the skill level of CTIs)

References

External links NIOC Colorado Sailor Earns "On-the-Roof Gang" Award

Worked examples

Example 1 — a first encounter with On the roof gang

Start with the simplest possible case. Write down what On the roof gang claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, 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 On the roof gang 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 On the roof gang 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 On the roof gang

In research: On the roof gang appears in computer science 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 On the roof gang 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: On the roof gang is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cryptography organizations, United States Navy, so understanding it makes those chapters shorter.
In everyday life: Look for On the roof gang 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 On the roof gang in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what On the roof gang 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 On the roof gang out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is On the roof gang in simple terms?

Why does On the roof gang matter?

Because it connects several computer science 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 On the roof gang?

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 On the roof gang.