Many Hesder yeshivos will have an American program (from a cynical perspective its to get money to support the Israel and Kollel programs they have, but that’s just being cynical). These students will typically learn there for 1-3 years and return to the US for college/yeshiva.
In some cases the hashkafos or emphases of the American program will be somewhat different from the Israeli program. Sometimes it will be closer to the standard ‘yeshivish’ model that most people think of. For example, many people say that about the American program in KBY, something I would agree with.