Headlines and Titles of Works

Q. When referring to the US Army Corps of Engineers, in saying “the Corps of Engineers” and “the Corps,” how should the shortened forms be capitalized? Should “the Corps of Engineers” be in initial caps and “the corps” be in lowercase?

Q. In the phrase “federal constitutional law,” should the “c” in “constitutional” be capitalized? I say no, but a coworker says yes.

Q. I am writing a text and need help with one thing. I checked your Q&A and didn’t see anything on this so I’ll ask here. Do government offices and bureaus need to be capitalized? For example, the Wireless Bureau of the FCC, or can it be listed in a sentence as the wireless bureau of the FCC? Thanks!

Q. I am unable to find a ruling on state nicknames in my Chicago manual. Am I overlooking it? Is it “aloha state,” “Aloha state,” or “Aloha State”?

Q. Should I capitalize “the states” when used alone (referring to the United States)? I’m copyediting a novel in which the author capitalizes “the States” when used alone. I think it would be lowercased.