The picture was taken in New York back in 1909. The man in the photo is participating in a sport that was briefly very popular in the early 20th century. People would don heavy canvas coats and fencing style helmets with thick, clear glass panels protecting their eyes - and then duel with each other using wax bullets. Often, as seen here, the guns even had guards like you find on a cutlass to protect their hands.
I had never heard of this before, but apparently is was popular enough back in the day that the sport was included in the 1908 Olympic Games.