(Definition of âditchâ from the Cambridge Advanced Learner's Dictionary & Thesaurus Â© Cambridge University Press) See all translations. us â /dÉªtÊ/. âº a long, narrow, open channel dug in the ground, usually at the side of a road or field, used esp. for supplying or removing water.
For a secret clearance in a national security position, the investigation requires agents to interview people who have lived or worked with the candidate at some point in the last seven (or more) years. There are four main types of security clearances for national security positions. These are confidential, secret, top secret (TS), and sensitive compartmented information (SCI).
Only federal agencies can grant security clearances. 1  Many federal agencies require security clearances depending on their mission and role in national security. Examples of agencies that may require higher levels of clearance include: 2  Intelligence community (e.g., CIA, NSA) 3  Federal law enforcement agencies (e.g., FBI, DEA, NCIS)