How US F-15 EX Fighter Jet Works?

This is How a Modern air dominance, precision strike, missile truck Works.
To carry this amount of weight the Aircraft is built with Spars and Ribs primarily made with aluminum alloy and titanium alloy.
This is How inside the New F-15 EX Uses Targeting Pods and Radar to make a Precision Strike.
They Use these Lantern Pods located to Direct Laser Beams.
In the back Ready the Weapon System officer Uses the Left Stick to point the laser and then pulls Trigger to paint the Laser and drops the Bomb at exactly where the it lands.
But why des the US needs the upgraded F15 Ex.
Well it all goes back to 1970s during the Vietnam war the Russian Mig 21 were faster made the US F-4 Phantom almost obsolete.