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UID:bf450204-cbbe-4fd6-bfb3-28e9a9bbd8fb
X-WR-CALDESC:12 August 1918: The 'Allegheny' field code was issued. Learn a
 bout American Army Field Codes in a document by William Friedman via the l
 ink at the bottom of the page.\n\nTrench codes were codes used for secrecy
  by field armies in World War I. A reasonably-designed code is generally m
 ore difficult to crack than a classical cipher\, but of course suffers fro
 m the difficulty of preparing\, distributing\, and protecting codebooks. T
 he Americans adopted a series of codes named after rivers\, beginning with
  'Potomac'. They learned to print the codebooks on paper that burned easil
 y and degraded quickly after a few weeks\, when the codes would presumably
  be obsolete\, while using a font that was easy to read under trench condi
 tions.
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DTSTART:20281105T020000
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
RDATE:20291104T020000
RDATE:20301103T020000
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DTSTART:20290311T020000
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TZOFFSETTO:-0400
RDATE:20300310T020000
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BEGIN:VEVENT
UID:61ff7e96-478b-4903-95bb-120cda1fc30c
DTSTAMP:20260426T190717Z
DESCRIPTION:12 August 1918: The 'Allegheny' field code was issued. Learn ab
 out American Army Field Codes in a document by William Friedman via the li
 nk at the bottom of the page.\n\nTrench codes were codes used for secrecy 
 by field armies in World War I. A reasonably-designed code is generally mo
 re difficult to crack than a classical cipher\, but of course suffers from
  the difficulty of preparing\, distributing\, and protecting codebooks. Th
 e Americans adopted a series of codes named after rivers\, beginning with 
 'Potomac'. They learned to print the codebooks on paper that burned easily
  and degraded quickly after a few weeks\, when the codes would presumably 
 be obsolete\, while using a font that was easy to read under trench condit
 ions.
DTSTART;TZID=America/New_York:20290812T000000
DTEND;TZID=America/New_York:20290812T235900
LOCATION:
SUMMARY:1918: 'Allegheny' Field Code was issued.
END:VEVENT
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