It seems somebody's decided that there's something sinister and secret about the
X-37B Spacecraft. Yahoo! News has dubbed it a
Mystery Space Plane and even Fox News calls it a Mystery Space Plane with a
Mystery Mission.OoooOOOooooh. Creeeepy.

The X-37B Being Prepared for Launch
On Orbit, It Will Creep Out the Easily Duped
Not So Secret, Really.Actually, this thing's been in the works long enough that its uses are pretty well known. But that doesn't sell soap or get internet clicks.
Check it out:Operationally Responsive SpaceliftNear Term Manned Space Logistics Operations(See the section on reusable logistical vehicles.)
Exactly why it should be such a mystery that the military feel the need for a reusable, quick-to-launch system is a mystery to me. The Shuttle is on its way to retirement and the military's been kicked off its manifest since the Columbia disaster. Current boosters like the Atlas and Delta vehicles are not quick to launch, not reusable. The ability of other nations to knock out satellites is already here, and that means there's a need to be able to field replacements quickly, especially since the military relies so heavily on satellites.

X-37B in Orbit, Stealing Ur Megahurtz
But mysteries sell, it appears. Even when it takes holding back well known information to
create a mystery, as the idiots in major media outlets have done here.
If you'd rather have information than mystery, keep reading:
Operationally Responsive SpaceResponsive SpaceFAST ProgramOf course, if you think we ought to hinder our own defense by
keeping it difficult to get to space, you can go back to your regularly scheduled conspiracy theories...

Sleek White Exterior, All the Better to Read Your Mind
Tinfoil hats, ON!