/**
  * @param $substatistic
  * @return string
  */
 public static function kwajalein($substatistic)
 {
     if ($substatistic === 'Launches') {
         return Cache::remember('stats:kwajalein:launches', 60, function () {
             return Mission::whereComplete()->whereHas('launchSite', function ($q) {
                 $q->where('name', 'Omelek Island');
             })->count();
         });
     } else {
         if ($substatistic === 'Last Launch') {
             try {
                 $lastLaunch = Mission::lastFromLaunchSite('Omelek Island')->firstOrFail();
             } catch (ModelNotFoundException $e) {
                 return false;
             }
             return $lastLaunch;
         }
     }
 }