Battle Born (Patrick McLanahan #8) by Dale Brown

Patrick McLanahan is back -- and this time he faces his most difficult challenge. He must pull together a team of aggressive, maverick young pilots to face a world on the brink of massive nuclear conflict.

It begins with a joint U.S.-Japanese-South Korean mock bombing raid. But the South Korean fighter pilots don't stick to the script. Instead, they race across the border into North Korea to support a massive people's revolt against the Communists.