Nametags Above Player

So I tried it out and it only shows your own nametag on your own character. It doesn't seem to actually show the other players names.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.Networking;
 
 public class NameTag : NetworkBehaviour
 {
     [SyncVar(hook = "OnPlayerIDChanged")]
     public string playerID;
     public Camera playerCam;
    public  Transform labelHolder;
 
     void Awake()
     {
       //  playerCam = GetComponentInChildren<Camera>();
         playerCam.gameObject.SetActive(false);
     }
 
     [Command]
     void CmdSetPlayerID(string newID)
     {
         playerID = newID;
     }
 
     public override void OnStartLocalPlayer()
     {
         string myPlayerID = string.Format(UserSession.username);
         CmdSetPlayerID(myPlayerID);
         playerCam.gameObject.SetActive(true);
     }
 
     public override void OnStartClient()
     {
         OnPlayerIDChanged(playerID);
     }
 
     void Update()
     {
         if (isLocalPlayer)
         {
             playerCam.transform.rotation = Quaternion.Euler(new Vector3(90, 0, 0));
         }
 
         labelHolder.rotation = Quaternion.identity;
     }
 
     void OnPlayerIDChanged(string newValue)
     {
         var textMesh = labelHolder.Find("Label").GetComponent<TextMesh>();
         textMesh.text = newValue;
     }
 }

Thats my code currently. Usersession.username grabs the users username.

The playerCam, as it's used in my tutorial is a third person camera that follows the player, so it should be disabled on all except the local player.

I'm not sure how you've constructed your player prefab, but you shouldn't need a camera specifically for the label.