The tablecloth is white -- symbolizing the purity of their motives when answering the call to duty.
The single red rose, displayed in a vase, reminds us of the life of the missing, and the[ir] loved ones and friends of these Americans who keep the faith, awaiting answers.
The vase is tied with a red ribbon, symbol of our continued determination to account for our missing.
A slice of lemon on the bread plate is to remind us of the bitter fate of those captured and missing in a foreign land.
A pinch of salt symbolizes the tears endured by those missing and their families who seek answers.
The Bible represents the strength gained through faith to sustain those lost from our country, founded as one nation under God.
The glass is inverted -- to symbolize their inability to share this evening's [morning’s/day’s] toast.
The chair is empty -- they are missing.