Hi, These are Norwegian and known Ensama Vargen or lone wolf tarp. As you can see from the diagrams on the tarp they can be buttoned together in lots of configurations. Each soldier was issued with one and then "buddied" up to make bigger tents. I have 6 of them and use them in all sorts of configurations. They're very hard to find and brilliant bits of kit! Only downside is weight. Heres a link to a great publication from the Norwegian army that tells some more info about set ups...
http://www.coe-cwo.org/files/handbooks/UD 6-81-6 (E) Instruction in Winter Service Biouvac.pdf
Just scroll down until you see the tarp set ups. Other useful stuff in it too!