Put these events in the order in which they occurred, starting with the earliest. Earhart and Noonan headed toward Howland Island. Commanders attempted to radio Earhart and Noonan for an update on their status. Various battleships around the world searched the Pacific Ocean for signs of both pilots. The U.S. Navy ship USS Ontario waited for both pilots to arrive.

To put these events in chronological order, we can analyze the sequence of actions related to Amelia Earhart and Fred Noonan's flight: 1. **Earhart and Noonan headed toward Howland Island.** - This is the initial event where they began their journey. 2. **The U.S. Navy ship USS Ontario waited for both pilots to arrive.** - After Earhart and Noonan set off, the USS Ontario was positioned to assist in their arrival. 3. **Commanders attempted to radio Earhart and Noonan for an update on their status.** - As time passed without communication, attempts were made to contact them. 4. **Various battleships around the world searched the Pacific Ocean for signs of both pilots.** - Following the lack of communication, a search operation was initiated to find them. So, the correct order is: 1. Earhart and Noonan headed toward Howland Island. 2. The U.S. Navy ship USS Ontario waited for both pilots to arrive. 3. Commanders attempted to radio Earhart and Noonan for an update on their status. 4. Various battleships around the world searched the Pacific Ocean for signs of both pilots.