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Getting bored while applying for jobs can be hazardous...

"What characteristics set you apart from other candidates for this position? "

Answer:
The simplest characteristic which would uniquely identify me from other candidates for this position would be a combination of social security number and employee identification number.
Biometrics would be the logical first choice. The main issue in this case would be that little or no biometric information on the candidates would be readily available from a reliable source.
The use photographs would be a likely second choice. Unfortunately they are a highly subjective means of identification and not usually screened for uniqueness. While photographs of all (internal) candidates would be easily available there is not available means of verifying authenticity or certifying uniqueness. Social security numbers and employee numbers on the other hand would or should have been already screened for uniqueness. Using both numbers together taps into two independent means of uniquely identifying me from all other candidates, one from the federal government and the other internal to the company. The available methods for spoofing such system would require preplanning to be done to far in advance. No one could know what number to spoof years in advance of a position because they could not have advanced knowledge of who the other candidates would be.
Naturally the most reliable method would be a genetic test but logistically that is the most complicated method to employ.