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LAKE COUNTY, Fla. — A Florida sheriff’s deputy was shocked by the selfless act of an Army veteran while he pumped gas on July 10th.

Lake County sheriff’s deputy David Causey had stopped to refuel his department SUV when he noticed an elderly man standing nearby, acting suspiciously, Fox 35 reports.

“I noticed this gentleman show up out of nowhere, standing behind my patrol car scanning the area (apparently better than I had been),” he posted on Facebook.

That man was Casey DeLoach, a 73-year-old Army veteran.

DeLoach remained until Causey had finished filling up his vehicle, when he said, “Thank you sir for what you do. I have your back.”

He then walked to his car on the other side of the parking lot and drove away without ever giving Causey his name.

“I just kind of stood there in shock, that an elderly man was willing to possibly put himself in danger to help me, a complete stranger,” Causey wrote.

DeLoach said he had been standing guard for law enforcement officers after the slaying of Texas deputy Darren Goforth at a gas station in 2015.

In light of the strained relationship between police and the public and the killing of five officers in Dallas, Causey described the encounter with DeLoach as “amazing.”