My son has recently lost (had stolen?) his Ti-89 calculator. Because he is paying for the replacement he would like to know which model of calculator the USAFA issues to cadets and/or if he is allowed to use his own. I read a thread that indicated the USNA issues the Texas Instruments Voyage 200 and gives their plebes a credit if they bring this model of calculator with them. If the USAFA has the same policy it might not be a bad idea to get some familiarity with the model calculator he will be using next year...especially since he has to purchase another one anyway. Anyone know what calculator the USAFA issues and whether cadets are allowed to use other models? Thanks.