Governments sometimes withhold information to avoid a panic in the general population so if for example they had information that aliens were planning to invade planet Earth they would quietly go about developing a strategy to combat the threat.
If, lets say, this hypothetical situation was imminent, they would probably already be training special forces in secret locations in space warfare and give them a silly, macho name like Space Aggressors or something.
Of course the Government, let's say the American Government to pick one, would be keen to keep something like that out of the media to stop people from looking at the sky and searching for a horde of rampant Alpha Centurions.
Anyway, in a hush-hush document there is a secret location near the Colorado's Rocky Mountains where teams called the '26th Space Aggressors Squadron' and '527th Space Aggressor Squadron' are training for 'conflict in a space environment'.
This follows a new department being created, the National Space Defence Centre, as part of the Multinational Space Collaboration effort.
Just a coincidence i'm sure.