Summary View Common Definitions of terms found in this announcement. Organizational Location: These positions are located in the Department of Homeland Security, U.S. Immigration and Customs Enforcement, Homeland Security Investigations, in Buffalo, New York; Irving, Texas; New York, New York; Scottsdale, Arizona; Seattle, Washington; Spring, Texas. These are non-bargaining unit positions. Responsibilities As a Mission Support Specialist, at the full performance level, you will perform the following duties: Coordinate and perform a wide variety of administrative and management services essential to the operations of the office. Serve as an expert on assigned administrative matters. Conduct studies on new requirements in program operations, legislation, or agency regulations. Provide authoritative advice and guidance to key stakeholders. Requirements Conditions of Employment Qualifications Please limit your resume to 2 pages. If more than 2 pages are submitted, only the first 2 pages wi...