What's a Superpower without redundancy?

“If you do not have presence to exert sovereignty, you’re a paper lion,” the Coast Guard commandant said in explaining why the United States needs to build three heavy and two medium icebreakers to operate in polar regions.
Adm. Paul Zukunft, speaking Wednesday at the Center for Strategic and International Studies, said the loss of the service’s current heavy icebreaker#– the 40-year-old USCGC Polar Star#— would leave the U.S. without a key capability.
“It is the one aspect I lose sleep about,” he said.
“There are no heavy icebreakers that we can legitimately lease,” to replace the ship.
https://news.usni.org/2017/05/03/coa...-s-icebreakers