Reading Grade Levels (RGLs) of 185 Rate Training Manuals (RTMs) and 188 Non-Resident Career Courses (NRCCs) were determined using the Flesch Reading Ease Score. Results indicated that the majority of the RTMs and NRCCs were written at the lower college grade level. The RGLs vary widely within each RTM and NRCC, ranging from the seventh grade to the college graduate level in many cases. It is recommended that the RGLs be interpreted with caution, because the relationship of reading grade levels and performance effectiveness has not been well established for any reading formula. Methods that could be used to improve the validity of reading formulas, as well as to determine factors involved in the reading skill development of experienced Navy personnel, are presented. (Author/AA)