To survive in our nation’s capital, you need a working knowledge of Acronym, the formal albeit unofficial (FAU) language of bureaucracy. Acronym is what you need to know so you know what you can’t know. SSI, CII, SHSI, SBU and FOUO are all current letter combinations that limit the public’s right to know and therefore your newsgathering. Each of these – and all of them collectively – represent a fourth level of classified information, more or less sanctioned by Congress, and enforced by expansive departmental regulations that have installed secrecy under the mantle of national security. Sensitive Security Information (SSI) is potentially the most expansive because it covers any information deemed to relate to transportation of any kind.