PACK,AMPHIBIOUS;U/C ASSY;22AMP-M-S Parts group: BEAM ASS'Y CENTER JOINT MAIN PIPING (1) MAIN PIPING (2) MAIN PIPING - PONTOON(1) MAIN PIPING - PONTOON(2) PONTOON ASSEMBLY(L) PONTOON ASSEMBLY(R) TRACK ASS'Y TRACK FRAME UNDERCARRIAGE ASSY AXLE ASSY AXLE ASSY