Future Combat System could cost $200 billion, but still lacks strong business case, GAO says.
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Study highlights oversight of contractor-run systems as an area that needs attention.
The increasingly popular international fund lost ground while the reliable government securities fund was the highest earner.
Contract notice discouraged competition, oversight body concludes.
Figures putting the total value of all federal responsibilities at $49.4 trillion over 75 years are attracting more attention.
Department official defends decision to diverge from approach recommended by oversight committee and consulting firm.
Current plans call for the Navy to step up purchases to two submarines per year in 2012.