I’ve never been to war or know much but aren’t most battles won by strictly air support (bombers, helicopters, surveillance, drones, multi-role fights etc) and infantry? Can’t a small force bring a large army to its knees by simply having air superiority and infantry.
Battles are won by combined arms....it is a very complex operation which involves everything from mechanics to pilots...
Intelligence gathering both on ground and in the air is essential...knowing where your enemy is, their strength and composition is paramount.
Sending recce elements with protection and engineers to survey routes for approach, then armor which takes the ground and infantry which holds it. Artillery is used to tactically engage targets and is called in by the lead elements.
Air elements are also essential, air superiority is also paramount but this is primarily so the enemy air forces are not able to engage your ground forces, or air forces, insert their own ground forces or gather intelligence. Drones are used quite a bit to gather intelligence and to deliver tactical payloads.
Naval elements are essential as in many cases they are also the air elements, they also can be the supply and personnel distribution network in various cases. They also control water ways so the enemy combatant navy can't engage your ground or air elements.
Special Forces are used for various roles, intelligence gathering, tactical and strategic strikes, engaging and eliminating key targets, disrupting enemy communications and controls, directing fire both from the air and ground and also directing conventional ground forces.
Cyber warfare is part of this as well. the ability to shut down the ears and eyes of your enemy is paramount.
In behind all this are the unsung heroes, signal operators, supply technicians, mechanics, transport people, medics, weapon techs, ammunition techs, military police, etc. These people keep the machines and people. moving forward.
As you can see, all these elements have to work together in order to achieve the mission.