NEW : It appears to be the first time Afghan insurgents have worn U.S. uniforms in years . The Taliban are also believed to be using a new type of suicide bomb that is more powerful than previous ones and can penetrate even hardened military armor. The last time CNN can identify was more than two years ago , when NATO repelled attacks on two bases in Khost province in August 2010 . The well-trained , well-armed attackers kill two Marines and destroy six jets . Four NATO troops killed by Afghan police were American , an official says .
NEW : It appears to be the first time Afghan insurgents have worn U.S. uniforms in years . The Taliban are also believed to be using a new type of suicide bomb that is more powerful than previous ones and can penetrate even hardened military armor. The well-trained , well-armed attackers kill two Marines and destroy six jets . Four NATO troops killed by Afghan police were American , an official says .