Pig in the pit - VOLUNTEERS DUTCH FIREFIGHTERS - 

daar heb je groot gelijk in want ik zit zelf bij de jeugdbrandweer en ik weet hoe de mannen ter werk ga. groetjes aan brandweer lunteren

The one with the red flaps on the shoulders is the “bevelvoerder” which translates into Commander in English. He is the one in charge over his crew and truck The one with the blue flaps is a bevelvoerder in training, He watches closely what the actual bevelvoerder does to learn. They can also swap sometimes so the trainee bevelvoerder is in command while the actual bevelvoerder looks over his shoulder as his shadow. Furthermore you have the orange flaps, which a rank/function higher than bevelvoerder. This is the Officier van Dienst (OvD), Officer of the Shift in you translate it roughly into English. He would be the commander on site and oversees the whole call on scene. From the OvD on out you can only go higher into officer ranks, like Head Officer of Shift, Commander of Shift, etc. Hope this explains enough :)

Red shoulder pads is commander, blue shoulder pads trainee / commander in training.