A word to describing "successfully passing a sentry"

pass

...from the General Orders (USN) for a sentry...

To be especially watchful at night and during the time for challenging, to challenge all persons on or near my post, and to allow no one to pass without proper authority.

If our soldier is (for example) just showing his badge and being let into this area, he's cleared, admitted, or allowed to pass. If he's sneaking by, you can also say he's cleared or 'slipped past' the sentry. If he kills/injures the sentry and/or smashes the door blocking access, you can use words such as 'neutralized' or 'broke into.'