But whose plan?

God's plan.

Do you think the families of the 13 marines killed in Kabul will be happy that their sons died because everything is going according to plan?

Everything goes according to His plan. It has never been any other way, and this is something we know. Our belief in His plan can falter at times (we sin and no one's perfect but God), but deep inside a good christian knows it's what it is. The families of those 13 soldiers should know that they died for His plan - and that they're know resting by His side.