Why is Frank Winter now wearing a private’s uniform?
Its all science fiction.
The Army manipulated us, Winter explains.

Credit: WGN
But Isaacs, to his horror, is unmoved.
The gadgets an inevitability, the younger scientist says.
You dont even care that weve been lied to?
Theres a war on three continents.
And a madman rounding up Jews, Isaacs says.
Then his pregnant wife, Abby (Rachel Brosnahan) comes into the room.
Shes pale, sweating.
And hes even less happy that the prisoner is back making trouble onhisHill.
One contains charges of espionage for sharing what he knows with Isaacs.
The other is an enlistment form.
Youre going to send me to the front?
Youll stay right here as a private in the Army under my command.
Unless you test my patience then youll get a one-way ride to the Pacific, Darrow tells him.
Its really not much of a choice.
Now go say goodbye to your wife, Darrow says.
Liza is furious at Frank for dragging her back when they were free and clear.
You told me two days, she says.
NEXT: Six months later…
We then flash forward six months to December 1944.
Best-educated grunt in history of the U.S. military, says the writer (played by Griffin Dunne).
What do you say we unbury that lead?
We see Frank bond with Private Dunlavey (Jefferson White), who still harbors feelings for his daughter.
Dont discuss my daughter, Frank says.
And dont call me sir.
Frank confronts Col. Darrow, who makes no apologies.
When I give an order, I expect it to be followed, he says.
She lost her baby.
Afterward, Charlie banishes Frank from the tech area.
From now on, if Charlie has his way, Franks just digging ditches.
(But who says Charlie gets everything he wants?)
Hogarth, the head of implosion, explains why he promoted Paul over Helen Prins.
Information is the future.
Hes a Brit, and so is Crosley.
Hogarth also has a photo of a young child on his desk.
Hogarth shows him and says this is Crosleys chance to go home to your little boy.
So, it turns out the name-change has a deeper reason than anyone else realizes.
Why did you let Frank back onto the Hill?
Shut him up or torture him?
he asks, before supplying his own answer.
Frank Winter is Darrows insurance policy.
Frank, we discover, is the one who solved the Little Boy uranium problem.
Darrow gives the pages of Lorentzens story back to him and agrees to let him publish.
Abby visits babies in the hospital nursery, and Frank opens a package at his desk.
Inside is a lighter he gave to Private Dunlavey before he was shipped off.
Frank takes the package to Liza.
Killed in battle in the Pacific.