Aim: In this research, the effect of the training given to the senior soldiers on the level of knowledge about sexually transmitted diseases was investigated. Methods: This research, which is planned as an experimental type with no control group, was conducted between March and April 2020 with the soldiers working in the 12th Mechanized Infantry Brigade Command located in the city center of Ağrı. Results: The pre-test of the soldiers of the rankings was a total score average of 11.66 ± 4.18, and the level of knowledge was low. The total score average of the post-test Sex Level for the Sexually Transmitted Disease of the ranking soldiers was 16.261 ± 3.78 and the level of knowledge was found to be high. A statistically significant difference was found between the total score averages of the pre-test-post-test Sexually Transmitted Disease Level of rank soldiers (p <0.05). Conclusion: It has been determined that the training given to senior soldiers increases the level of knowledge of sexually transmitted diseases, which is low. It is recommended to work in larger groups. Keywords: Sexually Transmitted Diseases, Education, Rank Soldier.