The primary purpose of this study is to compare the effectiveness of brief cognitive-behavioral therapy (B-CBT) for the treatment of suicidality, including suicidal ideation and attempts (regardless of Axis I or II diagnosis) among active duty military personnel. The standard null hypothesis will involve tests conducted comparing improvement following B-CBT (treatment duration of 12 weeks) to treatment as usual (TAU). The primary outcome comparisons will include both direct markers of suicidality (i.e. suicide, suicide attempts) and indirect markers including associated symptomatology (i.e. suicidal ideation, intent, anxiety, depression, hopelessness, substance abuse, and sleep disturbance), along with remission of psychiatric diagnoses. Secondary purposes include the prospective investigation of suicide risk factors and warning signs to explore these variables' ability to predict subsequent suicidal behavior following an index attempt.