Ever since World War II, governments have been storing lots of military equipment, most of which are military tents. This is why the government occasionally sells surplus military equipment. Both used and brand new tents are put up for sale or auction.
Sometimes, third party distributors will buy them in bulk and sell them as camping equipment to the average consumer. Because you can't go camping without a tent. There are some stores in the USA who are the leading supplier of military tents over 30 years.
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These surplus tents are often better choices than any commercial camping equipment sold in the market. They were originally designed to suit the military, so get assured that these tents were not made of weak material. They were designed to take on the roughest of weather conditions.
And since they're in surplus, you generally get them at a cheaper price. That's good quality at a low price, the best deal any buyer could ever dream of. However, not all these tents are sold at an equal state of quality.
Of course, most of the stuff that you will find in third party shops is checked for compliance with government standards, but there are shops that sell older tents at a cheaper price.