Questions about example sentences with, and the definition and usage of "Headquarters"

A: Headquarters, or HQ, is a place.

A: Thanks a lot for your help.

A: Usually, it is the main office where all the highest level executives are. Ford Motor Company has offices all over the world, but the headquarters are in Detroit.

A: The main office of a company, army etc.

A: A main facility or office of a business or corporation

A: You really wouldn’t use ‘headquarter’ in anything. It’s always going to be headquarters.

As for the sentence:

“The mission had been dangerous but was a complete success and now the soldiers were heading back to headquarters”

“Having finished the meeting the man was due to return to headquarters to brief the CEO on the outcome so they could work on projections for the next business quarter”.

A: "The company's headquarters are in California." This would mean that they run the company from their office in California.

A: “Headquarters” is where a person or, more likely, group conduct the bulk of their business.

“Permanent headquarters” refers to a place that will conduct the same kind of business for an individual or group for as long as they are able to stay. That organization intends to stay in place forever. For example, Buckingham Palace could be considered the permanent headquarters of the English royal family.

A: 同じです!

A: Moved implies the headquarters is changing locations. Transferred is used for a person. You are being transfered to the new headquarters.

A: It has the same meaning

A: You are correct.
"headquarters" is a noun.
"headquarter" is a verb derived from the noun "headquarters".

The noun is formed by combining "head" (adjective, meaning "the most important") and "quarters" (noun, meaning "lodgings"). That's why it is spelled that way.

A: Why was/were our company headquarters built in such a deserted area?

A: 예
You can also say “he has been moved to headquarters” or “he is based out of the headquarters” it is used in context of where someone is working so you can also say that “he now works at headquarters” or “he is working from headquarters”

A: "Headquarters" is one of a special class of nouns called a "plurale tantum" that don't have a singular form. "Headquarters is" and "Headquarters are" can both be correct.

Google's headquarters are in Mountain View, California.
Google's headquarters is in Mountain View, California.
Many companies' headquarters are in Delaware for tax reasons.

A: Headquarters - that's the way it's spelled. It isn't plural - it's a singular noun that ends with an 's'. "Headquarter" is not a word.

A: Then I would guess it is intended to mean "see inside (from outside)".

"Inside of" is used to describe the location of a thing or person within a place/environment.
"See inside" is used to describe looking at the environment

Examples:
"My computer was making a noise, so I took off the case in order to see inside." (implied: the computer)
"I was standing outside the house, but no lights were on. I needed to use a flashlight to see inside." (implied: through a window)