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Yep, bravo PCD, that's the one. They dropped a bunch of guys on Saint Mere Eglise, but too far in. The Nazis massacred them, leaving only a scattered few to coalesce into a subversion force. They didn't make much of a dent in the Normandy garrisons. This'll make a nice example for the developing "Fooled By The Noise" trope. Much thanks.

This is a World War 2 movie about paratroopers dropped behind Nazi lines in advance of D-Day. Since it's a nighttime drop, there's a danger of friendly fire. Therefore, each man is issued a clicker for Friend Or Foe identifying. One click-clack to query, two click-clacks to respond. One paratrooper hears someone coming and takes cover. He then gives the click-clack query, and gets the two click-clack response. Once this man emerges from cover, he discovers too late it's a Nazi soldier with a bolt-action rifle. The first click-clack jettisons a spent cartridge, the second click-clack chambers a fresh round. This may be a monochrome film, though I saw it on my old b+w TV set.
Edited by oneuglybunny