ATP 3-34.81 governs tactical and technical engineer reconnaissance supporting military activities across the full range of military operations.
View ATP 3-34.81 on armypubs.army.mil
It covers engineer reconnaissance planning, team capabilities, reconnaissance support, route reconnaissance, assessments, surveys, infrastructure, and environmental reconnaissance. It describes technical information collection, engineer resource assessments, route and gap-crossing measurements, and support to mobility, countermobility, and survivability.
Applies to: ATP 3-34.81 applies to Active Army, Army National Guard/Army National Guard of the United States, United States Army Reserve, Marine Corps, and Marine Corps Reserves unless otherwise stated.
Engineer units do not have designated reconnaissance organizations. (paragraph 1-1)
The assessment or survey teams are generally not employed when direct contact with the enemy is likely. (paragraph 1-27)
The assessment requires less time, but it provides less technical detail. (paragraph 1-28)
The primary focus of the ERT is collecting technical information in support of mobility. (paragraph 3-2)
The depth should be measured every 3 meters along the planned stream-crossing route. (paragraph 5-27)