Agreed. Other than the UK, and to a lesser extent, Canada, Australia and NZ which the US can ally as the Five Eyes without the NATO apparatus, is there any war the US engaged since the formation of the NATO alliance where the contribution by continental European allies made a significant difference to the outcome? And yes, that question applies to Afghanistan, the only time Article five was invoked, with US special forces militarily winning within two months and then changing the mission and proceeding to lose over the next 20 years. Vietnam, Iraq 1 and 2, Libya, the Balkans (which was of territorial vital national security interest to continental Europe and little to the Five Eyes)? My point is that nominal continental European military contributions, although nice for the feelgood optics of multinationalism, have always been militarily insignificant and irrelevant to ultimate war outcome
Maybe a little tough love is in order requiring them to form their own joint standing army and alliance for their defense with a separate Five Eyes alliance, which does not face the same territorial threats as continental Europe, that operates independently and has no hard baked in mutual commitments to a continent with money and manpower reluctant to defend itself.
“is there any war the US engaged since the formation of the NATO alliance...”
The purpose of NATO was not to help the US to wage war, it was to provide deterrence against other countries attacking any of the NATO countries.