What sample was taken by Presley O'Bannon in Iraq on 29 February 2008?

The correct answer pertains to the collection of a chemical wipe sample from an exploded bomblet, which aligns with the responsibilities and objectives of CBRN reconnaissance operations. In these scenarios, taking a wipe sample is crucial for detecting and analyzing chemical agents that may have been released during an explosion. This type of sample is designed to gather residues that may contain hazardous materials, thus allowing for further testing and assessment of potential threats in the area.

Collecting a chemical wipe sample, especially in the wake of an incident involving munitions, is a standard practice in identifying whether any chemical warfare agents were involved. This method provides a direct means to ascertain the presence of contaminants on surfaces, paving the way for necessary decontamination procedures and informing operational decisions.

Other sample types mentioned in the choices can still play a role in reconnaissance but may not have been the focus of the operation on that specific date. For instance, a liquid sample from a tank could provide insights into chemical composition, but it does not directly relate to the immediate investigation of an explosive incident. Similarly, solid samples from a bomb site and air samples from an urban environment are important but might not target the investigation of chemical agents released specifically from a bomblet, which is the central focus of the