U.S. Army Sgt. Bowe Bergdahl, the former prisoner of war who was held as a Taliban captive for five years, has finally returned to the United States.

After being rescued from captivity in Afghanistan on May 31, he was taken to a U.S. military hospital in Landstuhl, Germany where he underwent medical treatment.

Early Friday morning, he was transported by flight from Germany to San Antonio, Texas where he landed around 1:40 a.m. The 28-year-old solider will now begin the next phase of his rehabilitation and reintegration process at Brooke Army Medical Center, reports USA Today.

While there, he will receive care by the U.S. Army South command to help him re-acclimate to society. He will also undergo medical and psychological exams and interviews about his time in solitary confinement.

Pentagon Press Secretary Rear Adm. John Kirby released a statement early Friday saying: "There is no timeline for this (rehabilitation) process. Our focus remains on his health and well-being."

In midst of the controversy surrounding Bergdahl's rescue, he said that Defense Secretary Chuck Hagel is focusing on the need to support Bergdahl's recovery.

"[Secretary Hagel] is confident that the Army will continue to ensure that Sgt. Bergdahl receives the care, time and space he needs to complete his recovery and reintegration," Kirby said, reports Boston.com.

Hagel added Bergdahl was in the early stages of the road to recovery from the trauma of captivity. ''He's being held [in Landstuhl] because our medical professionals don't believe he's ready. ... This isn't just about a physical situation,'' Hagel said. ''This guy was held for almost five years in God knows what kind of conditions. ... This is not just about can he get on his feet and walk and get to a plane.''

President Obama has received a storm of backlash over his decision to trade Bergdahl's freedom in exchange for the release of five Taliban leaders who were being held at Guantanamo Bay. According to President Obama and military leaders, Bergdahl's health was in jeopardy and they needed to get him home promptly. However, critics say that Bergdahl's release came at a high price that's put American safety at risk, while others have accused Bergdahl of being a deserter.

Furthermore, both congressional Democrats and Republicans have criticized the deal and noted that the Obama administration failed to notify Congress 30 days in advance, as required by law.