To serve as Code Talkers, different men who spoke different Native languages had their own unique challenges to tackle to convey the essential military messages. Several tribal languages used in Code Talking were capable of more direct translations to deliver messages, and these coding systems were called Type Two Codes. In this instance, a Code Talker could simply translate phrases such as “C Company is moving east at 0830 in the morning” or “B Platoon needs more ammunition to their foxholes” directly and then convey them over the radio. Navajo Code Talkers, on the other hand, as well as Code Talkers from the Comanche, Hopi, and Meskwaki tribes, had to develop a special code based on their languages in what came to be known as Type One Codes. To develop their Type One Code, the original 29 Navajo Code Talkers had to assign a Navajo word for each letter of the English alphabet. Since this code would have to be memorized, the men chose words already familiar to them, such as those referencing animals. The English D became the Native word for dog, for example, while O was the word for Owl. Aside from this code, the original 29 also had to develop special words for terms relevant to essential military equipment, including types of planes, ships, and weapons. To develop these code words, the group was given picture charts that showed these essential items, and they developed words that seemed to best fit the picture shown. For example, the Navajo word for eagle was used to represent a transport plane, while a destroyer was coded as a shark, battleship as a whale, cruiser as a small whale, submarines as iron fish, and a carrier as a bird carrier. Comanche, Choctaw, and Hopi Code Talkers similarly developed these code words into their own Type One Codes. Aside from learning these codes, Code Talkers also had to receive proper training in handheld radio and field telephones, along with other signaling equipment and electronic communication lines, to ensure that their messages could be technically transferred no matter what. As Marines, the Navajo Code Talkers received their training at Camp Pendleton in California. With their codes developed and their training completed, Code Talkers increased their numbers and prepared for service on the front lines.