Tactics and systs. Joining meme today twtwo analysts workingg on optptions to help develop a key strategy. Bob isith the center for strategic and budgetary assessment. Welcome back. Full disclosure i know i have participated in some of the discussions you guys are going about doing the serious work here. Talk to us a little bit about the complexity city about the specific sets s of challengeges that we face. Folks are being g more open about some of the things we are facing specifically in our abilility to operarate around e world. Bob hes tryiying to o restore u. S. Convtion protectionn capability, and we essentially face for core problems. Ports and airfields are increasingly vulnerable to attack, and we rely on those bases to project power. Second is surface combatants including aircraft carriers, are increasingly subject to being tracked and targeted an extensive rangeses. Third, network and defenses make it difficult for nonstetealth aircraft to operate, and forth spac is no longe