President Trump warned Iran via a Tweet earlier this month that the U.S. had "spent Two Trillion Dollars on Military Equipment [sic]." But as ProPublica notes, this is "a mistake that military leaders have made for years: emphasizing weapons over the fitness of the men and women charged with firing them."
From here, we're shown a huge issue with the readiness of Navy and Marine forces in the Pacific Theater, including under-crewed ships, poor training, and a lack of routine maintenance. Sailors and officers in the Navy's 7th Fleet had been warning of various deficiencies for years, but nothing has been done. In December 2018, the GAO found that the Navy shipyards completed repairs on time in only 25% of cases. Earlier that year, the GAO had reported that Navy and Marine aircraft had repeatedly missed preparedness benchmarks. It added that, "Aviation readiness will take many years to recover."
This jives with what senior officers are saying. Vice Adm. Thomas Copeman told a symposium of Navy officers back in 2013 that readiness was in a "downward spiral," and that he foresaw a "hollow" force if things did not improve. He estimated that the Navy needed $3.5 billion just to address training deficiencies.