There are 50 K-9 units in the Metropolitan Transportation Authority Police Department, making it the largest mass transit K-9 unit in the country. (March 1, 2013)
Falcone, one of the 50 MTA K-9 units,
Falcone, one of the 50 MTA K-9 units, reacts after finding an explosives odor used during a training exercise in a train car at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, receives a reward toy after finding a sample during a training exercise with his partner, Sgt. Edward O'Flaherty, at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, sits waiting for a training exercise at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)

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Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, sniffs out an odor of explosives with his partner, Sgt. Edward O'Flaherty, during a training exercise in a train car at Grand Central Terminal in Manhattan. Falcone is named for Detective John M. Falcone, of the City of Poughkeepsie Police Department, who was shot and killed in February 2011. (March 1, 2013) (Credit: Rory Glaeseman)
Lt. John Kerwick, left, of the MTA K-9
Lt. John Kerwick, left, of the MTA K-9 unit, and Sgt. Edward O'Flaherty prepare a training exercise with one of their dogs at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, participates in a training exercise with his partner, Sgt. Edward O'Flaherty, at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, participates in a training exercise with his partner, Sgt. Edward O'Flaherty, at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, participates in a training exercise with his partner, Sgt. Edward O'Flaherty, at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)

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Falcone focuses on a box containing a sample
Falcone focuses on a box containing a sample odor of explosives during a training exercise in a train car at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Sgt. Edward O'Flaherty, left, walks with his partner,
Sgt. Edward O'Flaherty, left, walks with his partner, Falcone, through Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
MTA K-9 unit officers prep a train car
MTA K-9 unit officers prep a train car for a training exercise at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Lt. John Kerwich, tactical commander, center, and Sgt.
Lt. John Kerwich, tactical commander, center, and Sgt. Edward O'Flaherty, of the MTA K-9 unit, head to a restricted area during patrol at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
An MTA K-9 patch is presented on the
An MTA K-9 patch is presented on the uniform of Lt. John Kerwick, tactical commander for the MTA K-9 unit, at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)

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Lt. John Kerwick, tactical commander of the MTA
Lt. John Kerwick, tactical commander of the MTA K-9 unit, talks about the history of the unit at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, an MTA K-9 dog, sniffs out a
Falcone, an MTA K-9 dog, sniffs out a sample of an explosive during a training exercise in a train car at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, left, plays with his partner, Sgt. Edward
Falcone, left, plays with his partner, Sgt. Edward Flaherty, after he successfully found an odor sample of explosives during a training exercise at Grand Central Terminal in Manhattan. The dogs are rewarded with a moment of play if they find the sample during a training session. (March 1, 2013) (Credit: Rory Glaeseman)
Falcone, one of the 50 MTA K-9 dogs,
Falcone, one of the 50 MTA K-9 dogs, finds an explosives odor sample during a training exercise at Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
Lt. John Kerwick, tactical commander for the MTA
Lt. John Kerwick, tactical commander for the MTA K-9 unit, presents his K-9 unit vehicle near Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)
MTA K-9 dog Falcone walks with his partner,
MTA K-9 dog Falcone walks with his partner, Sgt. Edward Flaherty, outside Grand Central Terminal in Manhattan. (March 1, 2013) (Credit: Rory Glaeseman)