Can anyone elaborate the difference between F15s and F18s, they both have similar capabilities. Whats the difference between their roles?
Missions
F/A-18 is a USN aircraft. It can land on carriers. It's main role is the goal of the US Navy: to attain and maintain air superiority over any naval or amphibious combat zone, and to provide air support for other branches of the US Armed Forces, mainly the US Marines.
F-15 and F-16 are USAF aircraft. They cannot land on carriers *. Their main role is the goal of the US Air Force: to attain and maintain air superiority over any land combat zone, and to provide air support for other branches of the US Armed Forces, mainly the US Army.
Classes
F-15 is a heavy fighter (compare with the Russian Su-27), with no expense spared to make it as durable as possible for air-to-air combat, developed around the doctrine of beyond-visual-range (BVR) combat, aka my missiles can shoot you down before your missiles can and btw neither of us can see each other at this point. These fighters are extremely valuable and represent the epitome of US military aerospace engineering, and thus are only sold to the most trusted inner circle of allies (or pseudo vassal states, depending on your point of view). Note: Iran was in this circle before 1979, which is why they have the F-14.
The F-16 and F/A-18 are light fighters (compare with the Russian MiG-29), which are the scaled down versions of the super awesome no-expenses-spared versions, because
accounting and finance. Due to their stripped down role, it is easier to modify them or reconfigure them for different missions (the
Pimp My Ride of military aviation). These fighters are on sale now, as long as your country is on the NATO member list or a participating loyalty programme.
Additionally
The
F-15 Eagle is designed to be the ultimate air superiority fighter. But due to having no equal for most of its career, it also has a mod to make it suitable for air support: F-15E Strike Eagle, which is like F/A-15 on paper.
The
F-16 Viper or Falcon is mean to embody the Way of the Dogfight by the legendary John Boyd. However, the Air Force needed attack aircraft and it was cheaper to have a multipurpose fleet instead of fleets of mixed aircraft. So the F-16 also got pimped out for air support mods.
The
F/A-18 Hornet is really an attack aircraft that got pimped out with air superiority upgrades. Although the USAF does not operate any F-18s, several other air forces around the world do, including Canada
Future
The F-22 Raptor was intended to fully or partially replaced F-15 but due to it's astronomical cost, F-22 was stopped. Tactically speaking, the F-22 is basically a stealth version of the F-15, taking over the air superiority and occasional air strike roles.
The F-35 JSF (joint strike fighter) is supposed to replace the F-16 and F/A-18