Get on one of the towers next to the NOD Obelisk. The
Obelisk will charge up to fire at you. When it does, strafe left
to avoid being hit by the laser. After it has fired, strafe right
to avoid being hit by the laser the second time that it fires.
Repeat this and you will be glitching the Obelisk. Make sure not
to fall off the tower. You can use this technique to open a window
for your team to get in the enemy base or until you can be airlifted.