EXFILTRATION

'Exfiltration' is military jargon for exiting an area (usually behind enemy lines or in enemy territory). Exfiltration is the opposite of infiltration.
The removal of personnel or units from area under enemy control. The removal of personnel or units from areas under enemy control by stealth, deception, surprise, or clandestine means.
'Exfiltration' is also a term used by civil engineers. It is method for managing storm water runoff.

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