Moses lake TRACON controller reported an aircraft below the MVA and related issues.

Attributes
ACN	1669465
Time
Date	201907
Local Time Of Day	1801-2400
Place
Locale Reference	MWH.Airport
State Reference	WA
Environment
Light	Daylight
Aircraft 1
Make Model Name	Fighter
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 6
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X inbound for an IFR approach then rtb to ZZZ. Aircraft was level at 6;000 then issued a descent to 4;000. The aircraft read back 'out of 6;000 for 4;000'. They descended to roughly 3;000. I; the controller noticed this as they entered a 4;000 MVA. Controller issued a climb to 4;000 and heading to turn back into a 3;000 MVA. Controller asked if they could maintain their own terrain and obstruction clearance up to 4;000. The aircraft responded the first time with something similar to 'say again'. Controller reissued the instruction and they answered in the affirmative.the aircraft had omitted part of their return clearance and I had to reissue the specific instructions to them. If I had to guess I would say the pilot had low experience in an [type].

Original NASA ASRS Text

Title: Moses Lake TRACON Controller reported an aircraft below the MVA and related issues.

Narrative: Aircraft X inbound for an IFR approach then RTB to ZZZ. Aircraft was level at 6;000 then issued a descent to 4;000. The aircraft read back 'out of 6;000 for 4;000'. They descended to roughly 3;000. I; the Controller noticed this as they entered a 4;000 MVA. Controller issued a climb to 4;000 and heading to turn back into a 3;000 MVA. Controller asked if they could maintain their own terrain and obstruction clearance up to 4;000. The aircraft responded the first time with something similar to 'say again'. Controller reissued the instruction and they answered in the affirmative.The aircraft had omitted part of their return clearance and I had to reissue the specific instructions to them. If I had to guess I would say the pilot had low experience in an [type].

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.