The Greek symbol Lambda which these young French have taken to represent their movement. Found the tank images on a Google image search for Lambda. The tank images actually come from a very strange Messianic Evangelicals website about end times. Am not endorsing the link below, but it is interesting to say the least. The page was constructed back in April of 2011 when Fukushima reactors had just melted down and the US was attacking Libya. Kinda interesting if you are into that end times stuff. He claims the Lambda symbol, which he saw in a vision, also represents the 11th hour in scripture. Kinda weird some of the things you can find on a Google image search.
31 March 2011 (Chamashee/Teruah) Day #380, 5934 AM The Spinning Pyramid Three Visions on the Eve of Red April