In his book Unholy Terror, John R. Schlinder lays it out! Schindler was NSA’s top Balkans expert.
"This book reveals the role that radical Islam played in the Bosnian conflict of the 1990s--and the ill-considered part that American policy in that war played in al-Qa’ida’s growth. Schindler explores a truth long hidden from view: that, like Afghanistan in the 1980s, Bosnia in the 1990s became a training ground for the mujahidin. Unholy Terror at last exposes the shocking story of how bin Laden successfully exploited the Bosnian conflict for his own ends--and of how the U. S. Government gave substantial support to his unholy warriors, leading to blowback of epic proportions."
Eleven claimed to friends or family that they had combat experience in Chechnya.
None had any involvement in Kosovo.
Claiming that the NATO bombing during the Kosovo crisis in 1999 inspired Al-Qaeda to attack the US in 2001 is ridiculous.
A number of the hijackers were already in the US plotting their attack in 1997.
If any military hotspot in the 1990s was a training ground for Al-Qaeda operatives in the US it was Chechnya - several of the hijackers had been in Chechnya months before the attacks.
Not one hijacker could credibly be claimed to have recieved either money or training from the US in Bosnia.