From the perspective of 445 lesbian, gay, bisexual, and transgender (LGBT) U.S. military veterans, the present study examined hypothesized relations of sexual orientation disclosure, concealment, and harassment with unit social and task cohesion. Findings indicated that sexual orientation disclosure was related positively, whereas sexual orientation concealment and harassment were related negatively to social cohesion. Also, through their links with social cohesion, each of these variables was related indirectly to task cohesion. When the set of predictors was examined together, sexual orientation disclosure had a positive direct relation with social cohesion and a positive indirect relation with task cohesion, whereas sexual orientation-based harassment had a negative direct relation with social cohesion and a negative indirect relation with task cohesion. These data provide useful groundwork for evaluating military policies and practices regarding sexual orientation.Lesbian, gay, bisexual, and transgender (LGBT) persons have a history of serving in the military (Burrelli, 1994) despite military policies and practices that have barred these individuals from serving openly (Burrelli;Herek, 1993). The present military position on LGBT persons' service is expressed in a memorandum on military policy on homosexual conduct in which the Secretary of Defense asserted that "sexual orientation is considered to be a personal and private matter, and homosexual orientation is not a bar to service entry or continued service unless manifested by homosexual conduct" and "homosexuality is incompatible with military