Finish the game using Desperado Mode. Now during gameplay press the "hatch" & "Start" buttons and the VT will not fall.
Get 3rd Hidden VT
Accumulate 10 Medals.
Get 2nd Hidden VT
Accumulate 800,000 Command Points.
Get Full Screen Mode
Accumulate 550,000 Command Points.
How to unlock Hidden VT
On mission 7 or 17, go to the 2nd floor of the base. Then move to the small room located on the left and kill the enemy inside. Look near the back of the room for a box and get the transmission. Finish the level and the Hidden VT is yours.