No. That's what the US can afford to spend if it were to keep taxation and other expenditure level close to what they are now.
As we have seen, a country with a serious perception of external danger, and are willing to adjust revenue and expenditure in other areas to suit, can sustain military expenditure equal to 25% of GDP, or about 5 times the current American defense spending, for at least several decades.
What is more, the geographic circumstances of the US allows it to devote a greater fraction of its military expenditure to mainly offensive commitments, because the US is unusually well protected against enemy offensive commitments by its unique geographic position. So that means the US has to spend less to keep a reciprocal level of pressure on an antogonist on the Euroasia mainland, then that antagonist has to spend to apply the pressure on the US.
No. The circumstances have changed, and you are still thinking WWII deficits and spending when the US is spent already. Last time the debt:GDP ratio was this high was at the peak of WWII with wartime spending and wartime rationing; the US also won WWII and had the benefits of the spoils of war and of Bretton Woods in particular, establishing it as the
de facto world banker with all the benefits that accrued from that. Fast forward 7 decades. We are not currently in a war, yet the US deficit is already >100% GDP with BASELINE spending, and there are no signs it is going to go back down, ever. Unless it's the hard way down. The era of the King Dollar has already come to an end, and multiple countries have established and are establishing bilateral currency swaps that make the dollar totally irrelevant, multiple countries are buying oil in non-USD currencies, and multiple countries are accumulating more non-USD currencies as reserves in ever greater amounts. Just like rats deserting a sinking ship. When all this activity finally becomes a torrent, you will know the end is nigh.
As for "pressuring", an antagonist like China doesn't need to pressure the US mainland. The tyranny of distance wipes away any home field advantage that the US has. In fact China has to spend relatively less to fight a war in its near seas than the US has to spend to get there and stay there to fight with any degree of strength. To make things worse, the range of USN carriers has actually shrunk dramatically with the introduction of the F/A-18 series, to essentially half (or even worse) of the range of the aircraft they replaced like the Intruder, the Tomcat, and the Viking.