What is The Army, Air Force, Navy, Marine Corps, and Coast Guard? Motto for all

Technician a says that the sine with dwell (swd) test is used to determine if an electronic stability control system functions normally. technician b says that the esc lamp, called a telltale light, is required to remain on for two minutes. who is correct?

What kind of contact did christopher columbus and native americans initially have?

What are contributions made by rene descartes