This card is the part of a package for Drumsticks. I've sent a few of these cards away, too, usually Kraft Dinner or Jello. Some people ask for food packaging. The sender is former United States Army with 38 years of service! Today he owns and operates a 160 acre farm. Mattawan is located in south west Michigan and has a population of almost 2600 people.
The card comes from Šal'a, which has a population of almost 20 000 people. The biggest employer is a chemical company called Duslo Šal'a, while textiles and construction are also significant contributers to the local economy. The French on the front translates to: On the count of three, I'll take off!