Some of the U.S. and NATO’s best weaponry has been battle-tested, and has been found greatly wanting. From William Schryver at imetatronink.substack.com:

Yemeni Warrior Rejoicing over a Slain MQ-9 Reaper
Javelin, Stinger, M-777 howitzer, HIMARS, Excalibur, Switchblade, all manner of electronic warfare gizmos and counter-battery radars, Bradley IFVs, Stryker, Leopard, Challenger, Abrams, Patriot, JDAMs, HARMS, Storm Shadow, ATACMS … I’m sure I’m forgetting some.
Oh, yeah … remember in early 2022 when the unveiling of the Bayraktar strike drones was hailed with great fanfare? They were predicted to be the bane of the Russian army. Instead, it was a major embarrassment for the Turks.

Turkish Bayraktar TB2 Surveillance and Attack Drone
That said, over the past year or so, those “savage barbarians” down in Yemen have shot-down a baker’s dozen of the once-vaunted US MQ-9 Reaper drones – supposedly vastly superior to the Bayraktar TB2.

US MQ-9 Reaper Surveillance and Attack Drone
In any case, all of these things represent top-shelf front-line US/NATO war stuff that has been objectively proven inferior in the crucible of protracted high-intensity warfare. Many are simply ill-suited for the current state-of-play in the military realm, as it has been revealed over the course of the war in Ukraine.
Before this war began, the almost-universal belief was that US/NATO weaponry and equipment were far and away superior to anything the Russians could put on the battlefield.
That unfounded faith in the unrivaled supremacy of western arms has now been shattered — although we already see the think-tank apologists fashioning their strained rationalizations.
Nevertheless, when one examines in aggregate the implements of war the US/NATO have provided to Ukraine, the overwhelming majority consists of the very stuff every military in NATO would field in a war against Russia, or anyone else, for that matter.