Hidden in plain sight, six British snipers lie camouflaged in the greenery - but can you spot them?
The picture was taken in July on Salisbury plain and will test your powers of observation.
The Household Cavalry tweeted the puzzle on Christmas Day and promised to reveal the answer on Boxing Day.
Half a dozen riflemen are nestled away in the trees and bushes but the puzzle proved difficult at first so the Cavalry later posted an image with clues to the snipers' locations.
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The expert snipers use grass, trees and bushes for cover and it shows how they evade capture on the battlefield.
Scroll down for the answers.