Oh for sure. There's a whole industry of them, and they all milk Uncle Sam for everything the taxpayers worth with little need to produce real result. Look at SpaceX versus SLS. Well it's true that SLS design was handicapped by Congress requirement to use old shuttle parts, the result is still a giant boondoggle that is very late, tens of billions over budget, and best case is going to cost $2 billion for each launch (which can only happen once every year or so). Meanwhile, all SpaceX expenditures to date including development of Falcon 1, Falcon 9, Starship, Super Heavy, Merlin, Raptor, and construction of an entire spaceport in Texas, have cost them by most estimates less than Boeing took to design one rocket. SpaceX is launching Falcon 9 twice a week. And to compete with SLS, once Starship is online it could theoretically launch once a day for $20 million rather than once a year for $2 billion.

Private sector can be efficient, but only when their own bottom line depends on efficiency. When there's cost plus contracts involved, it really doesn't.