According to the Military Personnel Procurement Manual:
(d) The following conditions are not waiverable and should be considered permanently disqualifying.
26 Intestinal bypass surgery.
So yes it would.
The Defense Language Aptitude Battery (DLAB) measures an individual’s ability to learn a language and is also used to identify Marines that may be selected for follow-on language training.
In other words the Defense Language Aptitude Battery (DLAB) is basically a language proficiency test. “Marines fluent in a foreign language can earn extra pay based on that skill. To receive foreign language pay, a Marine must first take the Defense Language Proficiency Test (DLPT). The test is comprised of three parts: reading, listening and speaking, and is available at some base education centers” via a request form.
There is a great write up on Marines Blog By Cpl. Daniel Wetzel describing it. Some Marines in occupational fields 02xx and 26xx are required to take the test either during their recruit training or duty station.
As far as opportunities opening up to you, who can really say. It would be a great thing to have in a grunt (infantry) unit though, don’t you think.