"I think it's been the topic of conversation for every one... If the U.S. is hit again, how are we going to handle it? Our troops are all over the place"

Holly Johnson is describing the worry of another terrorist attack on the United States. After the 9/11 attacks, the U.S. has been on high alert and has taken actions to safeguard itself from more attacks. Johnson is asking how the U.S. will handle another attack, given that the U.S. has troops stationed all over the world. This is a legitimate issue, as the U.S. needs to be prepared to react to any attack, no matter where it comes from. Johnson is suggesting that the U.S. needs to be prepared to respond to any attack, no matter where it comes from, which this must be a topic of conversation for everybody.