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C-day stresses
construct.	календарный день (calendar day Alex Lilo)
mil.	день "С"; день начала развёртывания (войск)
English thesaurus
C-day
USA	The unnamed day on which a deployment operation commences or is to commence (JP 5-0)
C-DAY
abbr., mil.	Conversion Day; Day Deployment Operations Commence
C-Day
abbr.	Day in Which Movement From Origin Begins

C-day: 2 phrases in 2 subjects

Makarov	1
Molikpaq	1