US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil|US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA. edward.j.perkins@us.army.mil