amphibious operation/force/assault
From Longman Dictionary of Contemporary Englishamphibious operation/force/assaultamphibious operation/force/assaultPMan amphibious operation etc involves both sea and land vehicles → amphibiousExamples from the Corpusamphibious operation/force/assault• MacArthur stated that it was imperative to prevent the dispatch of an amphibious force.• Two other such joint exercises, involving marine and amphibious forces, were already scheduled to start on Aug. 3.