World War Two amphibious unit insignias

Here are insignia patches from some of the amphibious units of World War Two which included divers, engineers and explosives experts

Eagle perched on rifle, red, US Navy amphibious forces insignia authorized in June 1944. Original photo of Navy divers doing ship salvage

1st row, US Army, same eagle insignia but blue, authorized in 1942;
seahorse in white & blue oval, US Army 36th Engineer Brigade 1941-1944

2nd row, US Marines, crocodile with three stars on red, US Marine Corps 3rd division active 1943-1946; snake, gold III on red, US Marine amphibious unit active1942-1946