Some opioid antagonists are not pure antagonists but in fact do produce some weak opioid partial agonist effects, and can produce analgesic effects when administered in high doses to opioid-naive individuals.
Does the US Navy have 10 or 19 Aircraft Carriers? The U.S. Navy operates 19 ships that could be called aircraft carriers, but only considers 10 to be actual carriers. Last week the U.S. Navy accepted USS America, first of the America-class amphibious assault ships, into service.
As well as the fleet carrier/ supercarrier fleet, the U.S. Navy has nine amphibious assault ships used primarily for helicopters, although these also carry up to 20 vertical or short take-off and landing fighter jets and are similar in size to medium-sized fleet carriers.