No problem. There are more than that but they are largely recognized at the state level rather than nationally. Most states, though not all, follow the National Registry of EMTs (NREMT), which recognizes EMR, EMT, AEMT, and Paramedic. They create a standard that we have to test to and pass. Then we have to get licensed in our state after learning and testing for any and all state level protocol differences. An AEMT in one state may not be able to do the same things in the field as one in another state, but they generally have the same base level of training. Then some states have what they call EMT-I or Intermediate which is either between EMT and AEMT or between AEMT and Paramedic. There are even more than that out there and it gets pretty convoluted. Lol. But the 4 levels that the NREMT recognizes are basically the standard.