What was used by the US patrol coastal waters during the 1920s?

How did they break the Japanese secret code in World War ll? What did president harding's administration do to influence the American economy after world war i? Payments for war damage? What did people do to proteecttheir home in World War 2? How much do infantry lieutenants make? Why did the British use impressment on our sailors? How do you fight 3 people? What did Felix Zollicoffer do during the civil war? What opportunity did women receive as a result of the war? What is the tactical mission task in which another maneuver force moves to a position where it can engage the enemy by direct fire in support of another maneuvering force is? Why was Lincoln's skillful handling of the Fort Sumter crisis crucial to arousing the union's political determination to force the south to stay in the union? What did the end of the civil war mean for slavery? What affect did the union victory at Vicksburg have on the confederate garrison at port hudsun? Did the north or south have the larger fighting force? What was one significant and immediate cause of the Six-Day War also known as the June War? What president promised to return America to a healthy peacetime economy? Which president was put in prison after the war civil war? Did knights ever teach squires? What did children do during World War 2? What pacific island was captured by Americans after 6 months of jungle fighting during World War 2?