# put data into an array
open(FH, "file");
my @in=<FH>;
close (FH);

# loop through array
for (my $i=0; $i<@in; $i++)
{
   # if the line contains use...
   if ($in[$i] =~ /USE/)
   {
      # skip the line that had use in it, and loop
      # until the array is done or USE is encountered
      for ($i++; $in[$i] =~ /USE/ && $i<@in;  $i++)
      {
           print $in[$i];
      }
   }
}
[download]

Not as elegent as some of my fellow monks could probably come up with, but it'll do what you want.

Update: I must be the slowest typer on the site...