Rods From God are "kinetic bombardment." Tungsten rods are dropped from satellites, obliterating the target.
The US Air Force began fiddling with the idea in 2003.
On September 7, 2017, this article appeared: http://www.businessinsider.com/air-force-rods-from-god-kinetic-weapon-hit-with-nuclear-weapon-force-2017-9
The National Enquirer says Rods From God have been placed in orbit: http://www.nationalenquirer.com/photos/donald-trump-doomsday-weapon-north-korea/
Last night Thomas Wictor found a video that SEEMS to indicate that Rods From God have been used in combat: https://www.liveleak.com/view?i=be9_1506006236
He couldn't identify the surveillance platform that filmed the attack.
His guess is that the video is authentic.
The video shows the downing of a Syrian Arab Air Force Su-22 ground-attack aircraft.
We also see the downing of an armed Shaheed-129 UAV, operated by either Iran or Hezbollah.
The US has confirmed both incidents: https://sputniknews.com/middleeast/201709221057623211-us-coalition-syrian-aircraft-uav-shooting/
The videos use forward-looking infrared (FLIR).
There are two kinds of FLIR. Black hot FLIR: 
And white hot FLIR:
This is a missile seen with black-hot FLIR. See how it's a short line?
The missile engine is producing heat that quickly dissipates in atmospheric air.
This is white-hot FLIR.
The projectile left a massively long heat trail that dissipated instantly.
Here's the strike in real time and slow motion: 
Two small devices "guided" the large munition.
Wictor hasn't found this video anywhere except on Liveleak.
The "original poster" (OP) gave it this title.
Yes, we saw a tank, an Su-22, and a UAV destroyed.
But what the hell is THIS?
The OP is named "Serlik."
Joined in 2012 and has posted 12 videos during that period.
"Serlik" is a Jewish family name.
My guess is the person works for an organization with the word "Defense" in it.
I think we just saw Rods From God tested in combat.
This is what Mattis was talking about.
Remember: Rods From God are called "kinetic bombardment."
Mattis also said this:
This is almost certainly a rehearsal.
It's a great time to be alive.