Marking is a big deal in enlisted it is an important tool to strategize during matches. While it is fine by itself I believe that there is much that can be improved on that can be done by making the recon squad actually capped of recon. For example:
•marks made by a sniper last twice as long as any other soldiers
•marks made should have have a distance indicator if made with binoculars or through sniper scopes
•snipers can mark enemy squads, this will highlight a players entire squad for 3 seconds
I believe these 3 changes alone would give more purpose to recon squads and would add actual utility for choosing these squads.