Of course !!! He destroyed the Red Ribbon Army in his childhood. And he defeated the strongest men of this army. This army was the strongest in the world (of DB) and no one dared to fight against them.
I doubt he will get nuked. They won't know what is going on, they'll just think something different then what is going on. So they won't nuke him.
Well, he got shot in the side of his head by a 50. cal bullet from a sniper rifle in the show, and it made him say 'Ouch!' (rather painfully, hence the exclamation mark). So perhaps if they nuked him, or just got him surrounded by 50 million of every gun, missle, and Hello Kitty toy in the army and shot him, they could take him down... But I'd say if he could stay low and not get too cornered, I think he could do it fairly easily. Anyways, he's just one person, and he's never really gotten into that kind of situation when he was facing the Red Ribbon guys. But if he went all GIANT MONKEY OF DEATH, then I think he could take down the combined forces of the world in one giant mouth attack thing like he does... =P So yes =)
They'd have to nuke him eventually, the US of A doesn't take defeat well and its hard to sanction a single person...
well, Goku is not totally immune to bullets, as he is still hurt by them, if they use the new machinegun thingie against him(36000 shots per minute) he will e so sour he wont be able to move, allowing them to finish him off