Read the linked document, they looked at other vendors, all the other vendors that could meet the requirements needed to make significant (charged) customization to their product to bring up to spec. LM had the only product that could be used off-the-shelf.
While I generally agree that the government should buy something off-the-shelf that's already built -- and at a quarter-million dollars, this doesn't even come close to boondoggle territory -- sometimes the requirements are set explicitly to grant the purchase to a specific buyer the government had in mind, instead of the requirements really being generated in a neutral manner and then looking at the marketplace.
