Branch was the Nittany Lions second commit from the class of 2025.
Matthews was Penn State football's first commit for the class of 2025 before reopening his recruitment in September.
The renovations are expected to be completed before the 2027 college football season.
After 26 years of service with the Marines, Graham works as a professor, lab director, and coach at Penn State.
Kerkvliet is set to return for his sixth and final year of NCAA eligibility.
Wylie didn't appear in the Blue-White Game last month and was absent during the last few media availability of spring practice.