which is the newest generation of fighters serve in US amry?
The US Army has no fighter jets.
F35
edwin3060 is correct US Army - no fighter
US Airforce has the F35 and F22
F35 is more of a JSF used to support land assaults/battles
F22 would be the main air superiority fighter
but
it is US military tradition to only declassify up to two generations from their most recent technology therefore although publicly, F22/F35 is their best aircraft, they already have better crafts (maybe in prototype/experimental phase)