Ok, but I don't think it's different from so many three-letter agencies. People say that they were "investigated by (the) IRS" or "got a letter from (the) DMV"

Ok, but I don't think it's different from so many three-letter agencies. People say that they were "investigated by (the) IRS" or "got a letter from (the) DMV" all the time. One reads in the press about companies being "fined by (the) EPA" or people being "detained by (the) FBI". Dropping the "the" doesn't look that weird. Looking at https://www.cia.gov https://www.cia.gov they use both forms "work at the CIA" and "work at CIA" (google returns twice as many results for the former than for the latter).