There is no clear answer to the question of what happened to Private Dryden, as there are multiple individuals with that name in different contexts. Here is a summary of the information found in the search results:

• Private Curtis Dryden is a fictional character in the BBC drama series "Soldier". In the show, he is declared AWOL (Absent Without Leave) after not returning from leave.

• Diandre Dryden was arrested in 2023 for the murder of Latasha Smith in Gainesville, Georgia.

• Private Robert George Dryden died of wounds in France in 1916.

• Charles Walter Dryden was a Tuskegee Airman who died in 2008.

• Kenneth Dryden was a recipient of the Medal of Honor for his actions during the Korean War.

• Lieutenant Colonel Charles Dryden was a Tuskegee Airman who later became a professor of air science at Howard University and retired as a command pilot.

Without more information about which Private Dryden is being referred to, it is impossible to provide a more specific answer.