The US is sending up to 3,500 soldiers and 2,200 marines to Haiti to help rescue efforts in the wake of the devastating earthquake. President Barack Obama pledged one of the biggest relief efforts in recent US history and said Haiti would "not be forgotten" in its hour of need. The search for survivors continues but rescuers lack heavy lifting equipment and many are using their bare hands. The Red Cross estimates 45,000-50,000 people are dead and up to 3m affected. BBC correspondents say the situation is increasingly desperate, with aid only trickling in. Mr Obama confirmed that some US...