Not all maps have the UAV's. For me, I mostly use it to mark the enemy spawn point for certain maps as commander is able to mark more than SL (which have a cap of 3 or 4 markers). For enemy asset, I only mark the important asset or if friendly asset is nearby & they are blind that they did not know that certain enemy asset is just around their corner.
If i'm an SL, I will ignore commander orders as most of the time they give garbage commands which will lead me/my squad to my/their death. Unless commander provide critical information like active enemy mobile AA & etc which is important for me/my squad to destroy it. I have my own set of priorities on which enemy asset to destroy first base on the current map.
As per Blizzard reply above. But whoever is using that logi or if the map have only 1 logi, the person that is using it is FULLY RESPONSIBLE for dropping repairs for friendly asset. Always keep an eye out on the map, chat & etc for any repair request. Cuz plenty of times my asset got tracked, the person that using the logi totally ignore it in which inf squad kept requesting for armour support which i'm unable to provide.
Depending on the situation. Not all map have them. Sometimes it's not necessary as some flag just require experience players in that flag to cover spawn point in the cap zone & etc.