; (D) train designated personnel to use the slip-on unit; (E) ensure designated personnel possess elementary wildland fire management skills, including post-fire-front structure-protection tactics; and (F) maintain each slip-on unit in good, usable condition for a period of not fewer than 20 years; (2) during a large, active wildland fire— (A) staff each designated vehicle equipped with a slip-on unit with— (i) a person designated under paragraph (1)(B); and (ii) a trained firefighter, regardless of whether the trained firefighter is paid, volunteer, or off-duty but paid; (B) organize each designated vehicle equipped with a slip-on unit into a team with other designated vehicles under the direction of a qualified task force leader; and (C) use each designated vehicle equipped with a slip-on unit primarily for the purpose of following behind the wildland fire front— (i) to prevent homes from igniting; and (ii) to alert fire engines of structures that have ignited; and (3) comply with any other requirements determined to be necessary by the Secretaries, including any minimum requirements for a slip-on unit and any additional required equipment. 203. Assistance to States for operation of air tankers The Secretary concerned may provide funding to States to enable States to operate not more than 50 single-engine air tankers if— (1) the single-engine air tanker is government-owned and contractor-operated or government-owned and government-operated; (2) a State receiving funding for a single-engine air tanker under this section shares the cost with the Secretary of the acquisition and operation of the aircraft; and (3) the single-engine air tanker— (A) shall be used for initial attack