title: Retaining objects in game iphone
body: <p>I am trying to create a game and have run into what is probably a pretty easy problem to solve. </p>
  
  <p>As the player goes through the game, many objects (Vehicle) will be added and removed. </p>
  
  <p>The Vehicles get added to an array called currentVehiclesMutableArray.</p>
  
  <p>My problem is I cant figure out how to retain a Vehicle so that it remains in the array until I am finished with it. </p>