I'd say his first national issue though was cutting foreign aid, he started that campaign before the general election and got a lot of press for it - and he's still getting significant press for it. But, yes, the higher-profile issue at the moment for Rand is murder-by-drone. Really, since before the election right up to today, Rand has been the most prominent spokesman for the libertarian and genuine conservative wing(s) of the Republican party, much more so than Rubio or Ryan. If the next Republican Presidential primary were being held soon, I think it's clear that Rand would be the frontrunner among the conservative candidates.
"Alas! I believe in the virtue of birds. And it only takes a feather for me to die laughing."