The L3Harris BNVD-1531 is a variant of the extremely popular USSOCOM issued AN/PVS-31A BNVD. The BNVD-1531 was developed by L3 based on requests from certain end users that wanted a lower-cost variant of the AN/PVS-31A BNVD that had both an adjustable diopter as well as an onboard IR illuminator–essentially, a hybrid between the Legacy AN/PVS-15 and the AN/PVS-31A, hence the nomenclature BNVD-1531