Officers

One evening among visitors it has appeared five officers: the infantryman, the gunner, the pilot, the signalman and the sapper. One of them was the captain, three - majors and one - the lieutenant colonel. Also it is known, that:

• Yan has the same rank as the sapper and one more officer who serves in other arm of the service
• The signalman and Fer are close friends
• One of these days the officer-pilot together with Bel and Lay visited someone
• Recently gunner's radio-receiver stopped working and he asked Lay to help to the signalman to eliminate this malfunction
• Fer almost became a pilot, but then according to the sapper's advice chose another type of forces
• Yan's rank is higher than Lay's, while Bel's rank is higher than Fer's
• The fifth officer, Andy, was recently visiting Lay.

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This riddle was taken from this site.