Specifications include, but are not limited to: In January of 2019 the Department of Natural Resources (DNR) issued Invitation to Bid (ITB) 190000021 soliciting competitive bids for qualified contractors to provide as-needed fixed wing and helicopter services for use in emergency wildland firefighting for the Division of Forestry (DOF). A provision within ITB 190000021 allows DNR to issue periodic Open Enrollment periods during the contract term. This ITB is the seventh Open Enrollment period solicitation issued under this provision. The purpose of this Open Enrollment period is threefold: a) allow existing contractors to add new aircraft to, or remove existing aircraft from, their contract; b) allow existing contractors to increase or decrease their prices for aircraft currently on the existing contract; and; c) allow new contractors to be added to the contract.