DOVER AIR FORCE BASE, Delaware (AP) — President Barack Obama on Tuesday privately honored fallen forces returning home from war, this time the troops killed in a helicopter attack that claimed more American lives than any other strike of the Afghanistan war.

Obama was flown to Dover Air Force Base, where the remains were carried off a military cargo plane in flag-covered cases. His afternoon trip here was unannounced to ensure the security of his helicopter flight. Members of the media covering the trip agreed not to report on it until he had landed.

After about a half-hour flight from Washington, Marine One touched down at the base. The president climbed into a limousine that took him to the two C-17 aircrafts that arrived earlier in the day carrying the remains of the 30 Americans killed in Afghanistan.

The president boarded each plane to pay his respects to the fallen.

The White House said Obama then spent more than an hour meeting with 250 family members and service members gathered at the base, offering his condolences for their loss and his gratitude for their service and sacrifice.

Obama has been here before.

In the dark of an October morning in 2009, Obama watched solemnly as 18 Americans killed in the Afghan war came home, a visceral reminder of a war that has long slipped from the forefront of American debate. He would later call it the most powerful moment of his young presidency.

That trip to Dover left searing images of a president standing in salute on a cold tarmac in the dead of night. One family had allowed media coverage.

But on Tuesday, the president was honoring the fallen out of the public eye. The Pentagon said there would be no media coverage at the Dover base because the badly damaged remains from the horrific crash were mingled and still being identified.

A total of 30 U.S. troops, seven Afghan commandos and an Afghan interpreter died Saturday when their helicopter was shot down by a Taliban insurgent using a rocket-propelled grenade.

They had been packed into a twin-rotor chopper, en route to help coalition ground forces in a battle with insurgents. Many of the Americans who died were members of the Navy’s SEAL Team Six, the elite unit that killed al-Qaida leader Osama bin Laden in a raid in Pakistan three months ago. None of the SEALs killed in the crash took part in the bin Laden mission.

The devastating loss comes just ahead of the 10th anniversary of the Sept. 11, 2001 attacks on America that prompted the war in Afghanistan.

Some of those killed had been motivated to join the Special Forces by the 9/11 attacks that bin Laden masterminded.

The Defense Department has not released the troops’ names. Officials said it is taking time because there were so many killed. Others said privately there is hesitancy to release the names because the majority were from secretive special operations forces.

But the stories of the fallen have been emerging in the days since the crash. Those killed included young fathers, accomplished athletes and people of deep faith. One had dreams of becoming an astronaut after military service. All were deeply committed to the cause.

To Americans focused on economic crises at home, the death toll is a reminder that tens of thousands of U.S. forces will be in harm’s way in Afghanistan through at least 2014.

“We will press on, and we will succeed,” Obama said Monday in his first public comments about the helicopter crash. “But now is also a time to reflect on those we lost and the sacrifices of all who serve, as well as their families. These men and women put their lives on the line for the values that bind us together as a nation.”

The military calls the process of moving the remains a “dignified transfer.” Cases draped in American flags are carried off a giant plane, one by one, by a team of military personnel from the fallen member’s respective service. Each case is placed in a vehicle and then taken to a mortuary.

Top civilian and uniformed leaders will attend the proceeding, and so will some family members.

___

Associated Press writer Pauline Jelinek contributed to this report.

Copyright 2011 The Associated Press.