Need help finding a OPM rule for vets time credit

I am trying to find this to help my vet buddy out. I got this but i cannot remember the OPM rules for it.

As a disabled veteran of 30% or more with the disability being due to war time injury, you can convert your time served into federal time in service (when you get a fed job), without having to buyback.

Anyone know the rule or have a link?

Thank you :)

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Edit: Not the buyback program.

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Edit: I have this already, my service comp date has an extra 7 years served on it from my service in the army. no buy-in needed. I meet all requirements in the below edit

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Edit: Part of it is,

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Title 5 Section 6303

However, an employee who is a retired member of a uniformed service as defined by section

3501 of this title is entitled to credit for active

military service only if—

(A) his retirement was based on disability—

(i) resulting from injury or disease received in line of duty as a direct result of

armed conflict; or

(ii) caused by an instrumentality of war

and incurred in line of duty during a period

of war as defined by sections 101 and 1101 of

title 38;

(B) that service was performed in the armed

forces during a war, or in a campaign or expedition for which a campaign badge has been

authorized; or

(C) on November 30, 1964, he was employed in

a position to which this subchapter applies

and thereafter he continued to be so employed

without a break in service of more than 30

days.