Increase drag and the amount of thrust needed to move the airplane (Apex)
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The air molecules would not flow easily around the object and would create more drag.
It can weaken the wing, it creates additional drag, and will produce a larger radar reflection.
Tanks.
Leopard tanks can be destroyed from the air too. Brimstone, hellfire and maverick are some examples of missiles which are able to pierce the leopard armour.
Here's a list of the things airplanes didn't have then they have now: wheel brakes. Supplement oxygen. Closed cockpits. External fuel tanks. Metal construction. Jet engines. Retractable landing gear. Missiles. Air brakes. Flaps. Armor.
Try to find as many life tanks as possible. Missiles help too. Charge your missiles to defeat bosses. Good luck!
Increase circulation and oil cooling. Not all Harleys have external tanks
The military uses engineers for a lot, they design better tanks, jets, jeeps, missiles, guns, bullets, and so on.
Tanks, boxes, plastics, bottles etc.
Contrary to popular belief, the Space Shuttle is the orbiter, external boosters and external tanks combined. The bit that actually goes into space is called the orbiter.
Something you will never want to go against. A military of 2,000,000 active troops with Chinese military arms and lots of tanks and missiles. Is that strong enough for you?