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I think that this article ought to be moved to " Siege of Calais (1944)". The current name "Operation Undergo" give no clue as to what the article is about. The guidance in WP:MILMOS#CODENAME supports this. As an additional point when searching in Google books for "Operation Undergo" it threw up some books that surprised me until I read the text where it became clear that "operation undergo" is also a standard English phrase such as

• "The licensee's gambling operation undergo and successfully complete a sufficient number and type of practice gambling operations"
• "It is important to realize that careful selection of patients should be practiced so that only those sufficiently able to benefit from the operation undergo it."

-- PBS ( talk) 08:29, 12 September 2017 (UTC) reply

It might be best to leave article as is, since that is the official operational name, but perhaps put - also known as the Siege of Calais (1944)?. Eastfarthingan ( talk) 08:38, 12 September 2017 (UTC) reply