(DoD) Any obstruction designed or employed to disrupt, fix, turn, or block the movement of an opposing force, and to impose additional losses in personnel, time, and equipment on the opposing force. Obstacles can exist naturally or can be man-made, or can be a combination of both.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
| APA | Military Dictionary (DoD). (2011). obstacle. Retrieved September 22, 2026, from http://smartdefine.org/obstacle/definitions/1963108 |
| Chicago | Military Dictionary (DoD). 2011. "obstacle" http://smartdefine.org/obstacle/definitions/1963108 (accessed September 22, 2026). |
| Harvard | Military Dictionary (DoD) 2011, obstacle, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/obstacle/definitions/1963108>. |
| MLA | Military Dictionary (DoD). "obstacle" 4 April 2011. Web. 22 September 2026. <http://smartdefine.org/obstacle/definitions/1963108> |