There are G.I. Joe collector's clubs all over the world. I happened to discover one in Northern Virginia where I live. Back in 2006, a bunch of us gathered our collections at a rural farmhouse and set up a World War II battle diorama which consisted of over 1000s figures and over 100 vehicles. Additional diorama elements included a full scale village, bridges and guard gate.
Forget the gentleman that set this portion up, but the marching column of US soldiers was fantastic. Once again, it fell right into the many soldiers wearing the same uniform makes for a challenging jigsaw puzzle.