Mothers stopped at the MEPS door are sending their morning prayer through it with him

5:10 a.m., Kansas City: his duffel at the glass doors, and her own St Michael in her hand.

Four letters reached The Kitchen Window this fall, from three mothers and a wife: a recruit at the MEPS door in Kansas City, an officer on nights in Erie, a boy nine days into basic at Fort Jackson, a sailor bound for Great Lakes. All four ended on the same prayer and the same saint. Your son may be at basic, on nights, or three states away with his phone on silent. It is the same prayer.

I raised three sons, and I have stood at that kind of door. Tammy's story, from Joplin, Missouri, comes first, in her words.

The date went on the fridge, and Tammy joined the Facebook group for Fort Leonard Wood families to ask what every mother there asks: what can I give him to take?

• The group's answer. One mother wrote that he wouldn't have room for one single personal thing, and four hundred people agreed.
• Nine letters, written ahead. They would go by mail, not through the door.
• An Army Mom T-shirt. "He laughed at me in the kitchen."
• A pewter saint medal, $14, from the gift shop by her church. "Under the kitchen light I couldn't read one word on it. A gray disc with a man on it."

The other letters held the same drawer. Dana's (her husband Rob works nights in Erie): a thin blue line bracelet, now in Rob's cup holder, and a $9 rack St Michael that left a green ring on his neck. Sharon's (her son Jake ships to Great Lakes): a G-Shock still in its box, a compass bracelet Jake never wore, and a gift-shop medal her father turned over once. "Can't read it. Try again."

Each one was a kind thought. Not one was something he could carry through that door and read.

The week before he shipped, Tammy drove Tyler to the recruiting office to sign the last of his papers.

Staff Sergeant Boyd had been Tyler's recruiter for a year, a quiet man from Arkansas who says "ma'am" every other word. While Tyler was in the back with the paperwork, Tammy asked him straight out.

"Can he take a religious medal to basic, or will they throw it in a bin?"

"He didn't laugh at me," she wrote. "He hooked one finger in his collar and pulled it aside an inch. There was a thin chain."

Then the Army's own rule:

"Army regulation says religious jewelry is fine if it's neat and discreet, ma'am. Under the shirt. In PT clothes it can't show more than his ID tags."

Then the line she wrote on her hand in the car:

"If it gets bagged at reception, he gets it back. If it doesn't come in time, give it to him at graduation. Either way, give him his saint."

His saint. She knew which one he meant.

At the coffee maker before work, the same words for Tyler:

"Saint Michael the Archangel, defend us in battle."

Her grandmother taught it to her. As a girl, her grandmother had said it on her knees after Mass, with the whole church.

St Michael is the patron saint of soldiers.

So every morning she had asked one saint to stand with her son, and her son was about to walk through a door with nothing of that saint on him. Dana had the same gap: sixteen years of that prayer, and nothing of St Michael under the vest.

A St Michael medal is the saint of the prayer I already say, carried by the boy I say it for.

Tammy underlined that line in her letter. "Read it again," she wrote. "It's what changed my mind."

Not a charm. Her morning prayer, going through that door with him. If you say that prayer for him, you haven't been sending him off with nothing either.

Sixty words, counting the Amen.

In 1886 Pope Leo XIII ordered it said after every Low Mass, the priest and the people kneeling together, and churches said it that way until the 1960s.

Sharon's father has said it since he was an altar boy in Scranton in the 1950s. In 1968 a chaplain at Fort Polk handed out St Michael medals from a cigar box. He was twenty. He has worn his every day for fifty-eight years, and it's a smooth gray oval now, not one letter left.

At Sunday dinner, Jake asked his grandfather whether it had kept him safe.

"Boys in my platoon wore them too, and some of them didn't come home. It was never a deal with God. Every morning over there I said the prayer. That's what's on it. You wear the saint so you remember to say it."

The words wore off his medal because they were already in him. Jake had said the prayer once, off his mother's phone.

St Michael fights the dragon in Revelation, and the Church gives him to soldiers and police officers as their patron. That is why the chain turns up under so many collars.

Dana heard it from Luis, her husband's partner of nine years, at the grill during their son's birthday. "You know your husband's about the only guy on nights who doesn't wear a saint?" He pulled a chain from under his T-shirt. St Michael, rubbed down at the edges.

"Half the squad room has one. You pray for him, right? Every night? Then put the one you're praying to on him."

The department chaplain closes the Blue Mass with the same prayer every year.

On the medal, you're reading the prayer:

Her prayer goes where she can't, and it needs nothing from steel. What it can't do on its own is ride on his chest at a 5 a.m. formation, be read by a boy who doesn't know it by heart yet, or sit under his hand before a car stop. So the medal had five things to do:

• Be St Michael, by name, sword, shield and dragon: the lines of her prayer.
• Carry letters he can read across a table. Sharon's father: "Make sure he can read it."
• Lie flat and small under a uniform shirt, a vest or a dog-tag chain.
• Be steel that takes sweat, showers and ten weeks in a wallet.
• Be sold plain, so Father blesses it after Mass, free. Never bought blessed.

Try it on the one you have. Hold it under the kitchen light.

Can you read PROTECT US, in two words, at arm's length?

Or does the rim say PROTECTUS, as if nobody ever checked? Or nothing at all, on a black disc?

After the recruiter, Tammy looked at every St Michael medal online. Half were black discs; many said PROTECTUS. Then she found one that passed all five.

"I could read it across the kitchen table without my glasses," Tammy wrote. It met all five:

• St Michael with his sword and shield, over the dragon, on a round medal of 316L stainless steel, polished. Sweat and showers don't turn it.
• 32 mm across, a little bigger than a half-dollar, flat, 21 grams.
• ST MICHAEL PROTECT US, struck around the rim in two words.
• A 3 mm steel box chain, 24 inches.
• Gold or silver, chosen medal by medal. Tyler's is silver.

On him it sits under the collar, small enough for a dog-tag chain; on a woman it falls below the collarbone.

Rob's is gold, under the vest. Austin's is silver, in his wallet at Fort Jackson, and Michelle wears the gold. Sharon's father held Jake's under the dining-room lamp and read the rim out loud. "Saint Michael, protect us." Then: "That'll do."

Tammy found it at a small Catholic shop called Oremus, which sells it plain, for Father to bless.

On Sunday after the 10:30, Tammy walked the medal up to Father with Tyler beside her. He blessed it at the side altar in about two minutes, and he wouldn't take a dime.

Any priest or deacon can do the same, and so can a Catholic chaplain at Fort Leonard Wood or Great Lakes. The Church allows the blessing for a son who isn't Catholic, too (canon 1170).

What nobody can do is sell you one. The Catechism calls that simony (CCC 2121): "You received without pay, give without pay." Oremus says so on its own page.

All it takes is one line:

"Father, would you bless this St Michael medal for my son? He ships out next week."

Pam says thirty-some moms in Michelle's group now wear their son's saint while they wait.

All four bought the same way: Buy 2, Get 1 Free, three medals for $78, $26 each, gold or silver for each. The shop calls it The Family.

Tyler wears one, Tammy wears one, and the third went to his father, who said "we don't do that stuff" and has worn it every day since. Dana's third went to her dad, thirty years on the job; Michelle's to Austin's grandmother, who taught her the prayer; Sharon's to her father's old chain.

Against the drawer's $14 and $9 medals nobody could read, that's $26 a medal he can.

With The Family come the All Saints gifts, for orders through Sunday, November 8: seven by email the day you order, among them his prayer card to print for his wallet and a nine-day novena with his name in each morning's prayer.

Shipping is free and tracked in the US, 5-10 working days, from the shop's partner workshop in China, in a simple pouch. There's no box.

The Unbroken Promise: a refund on a photo within 30 days if it arrives damaged or not as shown, nothing to send back; a new one free if it breaks within a year. A lost medal isn't covered.

Tammy's door was glass, at 5:10 in the morning. Yours may be a driveway at 6:40, a phone face up on the counter, or a dinner table with your father at the head of it.

Read the prayer once more. Take the medal to Father after Mass. If his date is on your fridge, start saying the prayer tonight.

Either way, give him his saint.