There are two USOs in LAS airport! One in terminal 3 (open 8am to 8pm) and the other in terminal 1 (open 24/7)
This review is for the Terminal 1 USO! It's spacious enough with a kitchen, dining area, computer area, game area for kids, and private theater room/rest area. Their kitchen has fresh fruits, food, drinks galore, and even a wake up service. It's well-maintained and I can't really say anything bad about this place. It's not quite as fancy as the Phoenix USO, but it's got everything I need and it's 24/7!
Volunteers are great! They're all smiles and remember you. I've used the wake up service where you tell them what time you'd like to be awaken and get a little number stand to put in the reclining chair's cup holder.
Tip 1: it's 24/7! Make sure to go to the correct terminal! The other USO is only 8a-8p!
Tip 2: with a current active duty or reserve ID, you can obtain 2 coins to take the shuttle to/from the airport to hotels.