The headline is inaccurate, as the article actually says that the US Army has used nearly all of its long-range precision missiles, referring to ATACMS and PCM.

First, those are short- to medium-range weapons.

Second, the USAF and USN hold most of the US's long-range precision weaponry, the only real exception being the Long-Range Hypersonic Weapon (LRHW), which is not yet fielded.