at an altitude of . At least one version of that article noted the crew's "Eager Beavers" nickname. According to Zeamer's own flight log entry for the 16 June 1943 mission, and the 65th Bombardment Squadron morning report for that mission, the crew had increased the plane's active armament from 12 to 16 M2 Browning .50 caliber machine guns. The plane had custom-engineered twin .50s mounted in both waist positions and overhead in the radio compartment (rather than a single .50 in each position) and a single fixed .50 mounted on the deck to the right of the bombardier's chair, specially sighted and wired for Zeamer to fire remotely from his pilot's control yoke, through the lower right nose plexiglass ball socket. Additionally, three loose .50s were carried in the aircraft's catwalk for quick substitution in case any machine guns became inoperable for any reason. This accounts for the 19 machine guns Zeamer referred to in a 1945 issue of The American Magazine. As for the B-17's name, Zeamer's aircrew referred to 41-2666 only as "666" or "the plane". On 14 June 1943, two days before their final mission together, Zeamer officially named their B-17 Lucy. He had the name painted in script under the three windows on the port side nose, mostly between and underneath the small forward window and larger gun window on that side. This was in honor of Lucile Christmas, the daughter of Major General John K. Christmas, whom he dated stateside while stationed at Langley Air Force Base. Despite their extensive reworking of the B-17, Zeamer and his aircrew flew 41-2666 only five times, two of which were test hops. Standard bombing missions were flown by the other Flying Fortresses, reserving "666"/ Lucy and its specialty camera array for photo and mapping work. Mapping mission Zeamer's aircrew flew three reconnaissance missions in 41-2666, the last occurring on 16 June 1943. It called for a solo B-17 to map the west coast of Bougainville Island, almost over mostly open ocean from Seven-Mile, in support of a planned invasion of the island later that year. Such mapping demanded rigorously straight and level flight for the duration to avoid blurring of the photos, and this mission would require a 22-minute level run over hostile territory. Zeamer had volunteered for the mission when it was first requested in April, but weather and other factors forced postponements until the June