residence obligation

Permanent residents may be required to fulfill specific residence obligations to retain their status.

In some circumstances - notably where breaches of residence obligations are involved - permanent resident status can be lost before this date.

In fact, it is possible to hold a valid PR Card and at the same time face loss of permanent resident status due to not meeting residence obligations.

Prior to her marriage, she negotiated with Koss' family to defer the one-year Vulcan residence obligation required of newly-wed Vulcan females, in order to join Starfleet as a commissioned officer and stay aboard the Enterprise.