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MILWAUKEE, Wis. (CBS Local) — A young Wisconsin boy got the surprise of a lifetime Monday when his military dad showed up unexpectedly at gym class.

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Ethan Anderson, 7, had not seen his father in person for 20 months and wasn’t expecting to see him again until April.

Lt. Commander Jon-Andrew Anderson-Ingebrigtsen had been serving as the commanding officer of the Navy coastal patrol ship USS Chinook PC-9 in Bahrain since April 2017.

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When he learned he was returning to the U.S. earlier than expected for a new job at the Pentagon, he decided to surprise his son at St. Monica Catholic School in Milwaukee.

“I can’t believe it,” a grinning Ethan told the Milwaukee Journal Sentinel. “I didn’t recognize him for a few seconds because he usually wears a blue uniform.”

Anderson-Ingebrigtsen said he couldn’t be happier to see his son.

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“I feel amazing. We used to talk every morning on FaceTime. I’d call every morning at 4 a.m. in Bahrain and talk to him here before we go to bed… when I wasn’t on a mission. He’s here now, you can touch him… like he’s right there,” Anderson-Ingebrigtsen he told CBS affiliate WDJT.