You really need to define 'normal battle'.
Generally US infantry is patrolling in company-/platoon+ strength, but often as part of a larger BN operation (but often due to terrain/distances the companies are nowhere near enough to be mutually supporting). Having said that, for some bigger clearing operations BNs and even BCTs have been involved.
I would think you could get relatively realistic scenarios where you show a squad making contact and the rest of the platoon trying to maneuver to support and give the platoon access to company and higher enablers (CAS from fixed wing or rotary wing, BN mortars or field artillery from higher, BCT or higher echelon drones for ISR and some limited strike capability and so on.)
Since it is what we used to call a 'low intensity conflict' western (US, UK,NATO) forces tend to have resources they can throw at a Troops In Contact (TIC) event, but again, distances and terrain can very much influence the response times. And if you happen to be the 3rd element to get a TIC, available sorties may have already been allocated.
Using SOF type forces or local (Afghan forces) with SOF advisors you may see smaller US/NATO forces along with company-BN local forces. SOF direct action missions will generally be smaller.