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How the Marines fought the Korean War's greatest battle

In his new book, "On Desperate Ground," author Hampton Sides recounts the fateful experience of U.S. Marines and their clash with overpowering Chinese forces at the Chosin Reservoir in North Korea in November 1950, which has been called the Korean War's greatest battle. National security correspondent David Martin talks with Sides; Joint Chiefs of Staff Chairman Gen. Joseph Dunford, whose father fought at Chosin; and Warren Weidhahn, who was a private during the battle.

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What is Signal, the app used by Trump's team

The Senate Intelligence Committee heard testimony on Tuesday from key players involved in a group chat on the messaging app Signal, in which the U.S.'s highly sensitive plans to bomb Houthi targets in Yemen were discussed inadvertently with a journalist. President Trump said that his administration would investigate the government's use of Signal. CBS News contributor and former CIA official Andrew Boyd has more on what it is and how it's used.

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