(eks.fil.TRAY.shun) n. 1. The surreptitious movement of personnel out of an enemy's territory. 2. The theft and/or smuggling of goods out of an enemy's territory.

Example Citation:
  1. "The MH-53J's mission is to perform low-level, long-range, undetected penetration into denied areas, day or night, in adverse weather, for infiltration, exfiltration and resupply of special operations forces."
    —Jeff Goertzen, Ron Brackett, "Treacherous terrain," St. Petersburg Times, September 30, 2001

  2. "A senior military officer, after confirming that intense planning for the possible 'exfiltration' of Pakistani warheads was under way, said that he had been concerned not about a military coup but about a localized insurrection by a clique of I.S.I. officers in the field who had access to a nuclear storage facility."
    —Seymour M. Hersh, "Watching the Warheads," The New Yorker, November 5, 2001

Earliest Citation:
  1. "Occasionally, of course, the military gets so carried away in its passion to rename things that it cannot persuade anyone to use its most imaginative terms. Resisting any mention of retreat, it devised the word 'exfiltration,' but even its own spokesmen find that hard to say."
    —Otto Friedrich, "Of Words That Ravage, Pillage, Spoil," Time, January 9, 1984

  2. "Until Stockman's arrest on April 25, 1982, soldiers caught in smuggling attempts were not court-martialed. ... According to Sgt. James M. Welker ... a more severe punishment was meted out to Stockman and Pierce partly because Army officials in Berlin 'firmly believe that, based on past Soviet reaction, the Soviet Union might attempt another blockade of the city because of acts of exfiltration' by American servicemen."
    —Sandra G. Boodman, "Berlin Rescue Failed," The Washington Post, June 17, 1983

The first sense of today's term is clearly the opposite of infiltration. The second sense is more problematic. It may simply be an unfortunate generalization of the first (unfortunate, since an infiltration applies only to people, not objects). However, it may also have sprung from the non-military meaning of exfiltration: "The action or process of filtering out." Since both senses are used in military contexts, my vote goes to the generalization theory.

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