The Egoz recon unit of the Israeli Defense Force is trained is an elite group trained in guerilla tactics. Sometimes they operate in cities. But sometimes, as seen above, they hide on the hills. Watching. Waiting. They're very, very good.
If it takes you more than a few seconds to spot both of the soldiers here, blending in among a rocky patch of northern Israel—too bad! They've probably already killed you. No hard feelings.
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For reference, here's what the Egoz crew looks like when not trying to look like a pile of rocks.
[IDF Flickr via The Aviationist]