public function notify()
 {
     // What notification type is this
     if ($this->timeRemaining->hours == 24) {
         $notificationType = NotificationType::TMinus24HoursSMS;
     } elseif ($this->timeRemaining->hours == 3) {
         $notificationType = NotificationType::TMinus3HoursSMS;
     } else {
         $notificationType = NotificationType::TMinus1HourSMS;
     }
     // grab all users with this particular notification
     $usersToNotify = User::whereHas('notification', function ($q) use($notificationType) {
         $q->where('notification_type_id', $notificationType);
     })->with('notifications.notification_type')->get();
     $messageToSend = sprintf($this->message, $this->nextMission->name, $this->nextMission->vehicle->vehicle, $this->timeRemaining, $this->nextMission->launchDateTime, $this->nextMission->launchSite->fullLocation, $this->nextMission->slug);
     // Send!
     $sms = new SMSSender();
     $sms->send($usersToNotify, $messageToSend);
 }