"Seaman Stripes" on uniform jacket?

[MarkTheWanderer]

Studying up on knowledge, and I can't seem to find any information on what the stripes on the forearm of the dress blues stand for. I know they are part of the Navy's rank insignias, but can't find anything online about what it means for Marines.
dress blue.jpg

Example ^, two stripes on this SSgt's Jacket.

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[USMC 2571]

Those are "hash marks". Each stripe denotes 4 years of service.

[USMC 2571]

The correct name for it is "service stripes". So that Marine has been in at least 8 years. Perhaps more, but at least 8. Upon 12 years in, he'll have a third service stripe.

[MarkTheWanderer]

Thank you Sergeant.

[USMC 2571]

Glad to help.