And they never will. ULA is the roll up of the USA's 2 major launch systems, Atlas and Delta. The USA has put Titans out to pasture, probably with good reason. Everybody in charge knows nothing but one-shot launch vehicles. The culture is going to be totally against any kind of re-usable vehicle. Which may not even be cost-effective, but ULA is not the place that would try it.
Bruno said reusable rockets' time will come, but it's not here yet.