Wendy,
Your father’s diary entries are of great interest to me, not only as they give his personal thoughts of each mission, but also represent at least his whole Squadrons efforts of “The Target for Today” scenario. In addition, whenever I learn something new it is rewarding to me, case in point the Messerschmitt Me 410 was a new Nazi aircraft to me. The following is a description of this aircraft, with a video below:
The Messerschmitt Me 410 Hornisse ("Hornet") was a German heavy fighter and Schnellbomber used by Luftwaffe during World War II. Though essentially a straightforward modification of the Me 210, an improvement”?” over the original fighter variant Messerschmitt Bf 110, it was designated the Me 410 to avoid association with its notoriously flawed predecessor. It’s not clear to me how effective this aircraft was in its role of heavy fighter/light bomber compared to the USAAF’s Lockheed P-38 Lightning or Northrop P-61 Black Widow, twin engine fighter/bombers. It would appear the Me 410 never fully improved on the design deficiencies of its predecessor the Me 210 which struggled with poor flight characteristics since its inception and first flight in 1939, having said that the Me 410 was armed as follows and would not be a pleasant sight in the sky for USAAF bomber crews:
Armament
Guns:
2 × 7.92 mm (.312 in) MG 17 machine guns with 1,000 rpg, firing forward
2 × 20 mm MG 151/20 cannons with 350 rpg, firing forward
2 × 13 mm (.51 in) MG 131 machine guns with 500 rpg, each firing rearward from FDSL 131/1B remote-operated turret, one per side
Bombs: up to 1,000 kg (2,204 lb)
In answer to your question about promotions; yes, combat promotions were quite common as the aircrews and airmen gained combat experience.
Scott
Target (5) Solingen Germany 01 Dec 1943 at 27,049 ft
Overview map as of 01 Dec 1943

Messerschmitt Me 410A1