ECWCS Gen III Level 6 ParkaECWCS Gen 3 Level VI Parka, "New OCP," USGI RFI Issue. The Level 6 Parka Jacket is generally considered to be the replacement for the "Old School" Gore Tex Jacket from the 1990s which in turn replaced the M 65 Field Jacket, and brought cold weather gear into the modern era. This jacket is not heavily insulated it is meant to serve as a hard shell wind moisture barrier jacket, on top of other insulated layers (Level 1 2 3). The Gen 3 Layer 6 Jacket in