But its avowed ambition is to have a blue-water navy such as the country has not possessed since the 15th century.
The secretary touts the advantages of the Littoral Combat Ship (LCS) as a versatile ship that go places too shallow for the Navy's blue-water ships.
This means having a nuclear deterrent, a deployable army division, a blue-water navy with two aircraft carriers, and an air force with fighters and deep-strike jets.
In some cases, sunlight shines through holes in the cavern ceiling, illuminating the beautifully clear, blue-tinted water giving it an otherworldly feel.
When it reaches the top, Thom steers away from the wind, the enormous sail billows out to leeward and the yacht's mahogany hull digs deep into the blue-green water.
After negotiating their way down a series of steps carved into the steep rock face, explorers of the Blue Lake Grotto are faced with a deceptively deep pool of limpid blue-green water.
Deep into the autumn, every package or can I open takes me back to conversations around the cookhouse's huge stone fireplace, to wind rustling through alders, and sun-spangled blue-green water, to the promise of adventure every morning.
The appeal of other keys, meanwhile, lies in their sparse beauty: many are little more than a lone sandy outpost in gin-blue water.
Speckled by ancient ruins, it even has a wine route: the Strada del Vino Costa degli Etruschi, which runs south from Livorno to Piombino and across to the island of Elba, edged by searing-blue water and with views to sigh over.
Karpathos is small, stretching seven and a half miles in length and a mere two miles at its widest point, yet it manages to squeeze in a great variety of landscapes, making it perfect for outdoor pursuits: world-class surfing beaches, roads with soft hills ideal for cycling, and shimmering, glass-blue water for swimming and snorkelling.
The water reflected the gray-blue of the darkening sky, and the lights of the water-pumping stations had come on, making them look like a line of floating gazebos.
Another trend: it seems that every new collection includes at least one model with a deep-water-blue face and matching alligator strap.
And I share this often -- as many of you know, my father was a blue-collar worker at the city water plant.
They're the values that so many of us were raised with, including myself. (Applause.) I told this story earlier, but my father was a blue-collar worker at the city water plant.
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Event bosses have been forced to cancel the Great North Swim in Cumbria after blue-green algae was found in the water which could be dangerous.
In fact, several of the more sophisticated spots are in hotels, including the glass-walled Blu Horizon in the Shangri-La overlooking Sydney Harbour, Hemmesphere in the Establishment Hotel and the cavernous lobby-level Water Bar in BLUE Sydney.
Of course, Mr Letwin and Mr Cameron, both old Etonians, may simply be attempting to put some clear blue water between themselves and the more populist - or wilfully philistine depending on your point of view - elements on Labour's front bench.
Any beach with a blue flag has to display its water quality results, on easy-to-read signs.
But in this one, Lyra Belacqua (played by Dakota Blue Richards) has her own posse, made up of water-dwelling Gyptians, fierce urchins, changeable spirit daemons, plus a bear, a witch and a wardrobe of skirts.
In case you don't have your smartphone app handy, the taps are equipped with LED lights to show the water's filter status as well -- blue means clean, yellow means not so much and red means you should probably get a new filter, pronto.
Beyond, purple-shaded mountains rise from the deep blue mist like ships floating on water.
The latest sea-surface height measurements reveal unusually cool water (shown as blue and purple) and sea levels that are two to seven inches below normal, extending from the Gulf of Alaska along the coast of North America.
Made from personally selected blue agave plants, multiple distilled with pure spring water, it gets its platinum color from ultra-modern filtration, and is finished by hand with an extra anejo tequila which has rested in oak barrels for five years to enhance the flavor.
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Opened in 2010, the light-filled building with its pale-wood furniture and splashes of bright blue and yellow prides itself on being an eco-friendly hotel that pays close attention to its energy and water consumption and contributes to the community (for example, the mostly organic breakfast is provided by local bakers and greengrocers).
At 138 feet she's a navy-blue missile with a nearly flat deck, huge winches and an almost impossibly sharp bow that overhangs the water like a scimitar.
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