This study would be the first randomized placebo controlled trial to examine the efficacy of Transcranial Magnetic Stimulation (rTMS) for PTSD. The primary hypothesis is that there will be significant improvement in the patients' PTSD symptoms from pre-treatment to post-treatment with rTMS. A secondary hypothesis is that the patients’ co-morbid depressive symptoms will improve from pre-treatment to post-treatment. Forty subjects with PTSD will be recruited from the White River Junction VAMC. Patients will be randomly assigned to receive either active rTMS or sham rTMS. Patients, staff performing the treatments, and staff completing the assessments will all be blinded to active or sham treatment.