A selection of rare photos of Jagdgruppe 300 and/or JG 300 wrecks most probably photographed at Salzburg Ainring during April/May 1945 following the capture of the airfield by US forces recently sold on Ebay.
http://www.ebay.com/itm/B32-WWII-665th-Eng-35mm-Slide-Bf-109-Me-109-/170888625109#ht_974wt_1165
More from this seller
http://www.ebay.com/itm/B30-WWII-665th-Eng-35mm-Slide-Captured-FW-190-ME-109-/170888625021
http://www.ebay.com/itm/B33-WWII-665th-Eng-35mm-Slide-Bf-109-Me-109-/170888625136#ht_974wt_1165
Note that the (probably) Erla-built G-10 (see photo above) features blue/white/blue fuselage bands and a short Gruppe bar. Jagdgruppe 300 was 'officially' established through the amalgamation of II. and III./JG 300 in April 1945 and is mentioned in a Luftflottenkommando 6 ORB dated 03 May 1945 (!) but as the following account indicates probably only 'existed' on paper. It is hard to believe that anybody was still applying Gruppe Balken in April 1945 - especially since III./JG300 & IV./JG300 never utilised Gruppe markings, while I./JG300 had already been disbanded - but had Bf109G-10s in the WNr. 491000 series.
Adapted from the history of JG 300 published by Editions Larivière entitled 'Bataille dans le Ciel d'Allemagne' by Jean-Yves Lorant and Richard Goyat (my translation..), the following is probably the only personal account to make mention of a 'Jagdgruppe 300'...
On 30 April 1945 , in one of the final actions of the war for JG 300, III./JG 300 put up four Messerschmitt Bf 109 G‑10s and K‑4s from Klein Karolinenfeld to fly a ground attack sortie against US forces driving deep into southern Germany. The pilots had instructions to fly on to Salzburg Ainring once their mission was completed. The Schwarm was led off
by Fw. Arnulf “Timm” Meyer (9. Staffel) and headed out at low-level for an American motorized column north-west of Rothenburg ob der Tauber. Aside from Meyer, three other experienced pilots were airborne for this last
sortie: Uffz. Klaus Lambio (former wingman of Ofhr. Grothues) as well as Unteroffiziere Jochen Stiege and Günther
Obst (9. Staffel). “Timm” Meyer
never forgot the events of 30 April:
Only Lambio and Stiege managed to reach Salzburg-Ainring, to where several other Luftwaffe units had also fallen back. Just as the two pilots were climbing down
from their aircraft, the airfield came under attack from Thunderbolts. Klaus
Lambio was able to recall his arrival at Salzburg-Ainring years later:
"...In front of my 109 I saw a mechanic throw
himself face down in the grass… It was at that moment that I realized that the
roaring engine noise I could hear was not familiar. Streaking past to my left
barely twenty metres off the ground, two Thunderbolts roared low overhead, strafing aircraft and installations and setting off a widespread stampede for cover. Then
two or three other Americans released napalm bombs. I saw two P‑47s disappear off to
the south trailing smoke. In the mid-distance a parachute swung for a few
seconds above the trees of a small wood. None of this was really important any more as Salzburg-Ainring was going
to be our last airfield and would soon come under threat from the enemy advance. Hauptmann Fritz Lonzius
put in a quick appearance a few moments later and brought us together in front
of an ad hoc command post. It was then that I realized that a few
III./JG 300 pilots had managed to land on this field. More arrived towards
the end of the afternoon, landing at the controls of two Messerschmitt
Bf 109s and a Bf 108. There was no more than a handful of us men left
now. For the first time, “Timm” Meyer and Werner Maybohm were absent from this
roll call. About twenty pilots and around one hundred male and female
mechanics, had preferred to surrender to the Americans rather than undertake
the dangerous road journey to Salzburg. We were told that henceforth our new
designation would be “Jagdgruppe” 300 and not Jagdgeschwader 300. For my part,
I flew no further combat sorties prior to the capitulation, apart from one
short airfield protection flight on 2 May 1945 in the 109 marked with the
double chevron of Hauptmann Lonzius. As I recall Lonzius had fled to Linz in a
Bü 181 that same day. Our Gruppenadjutant Willi Miholek even claimed that
he had put on the overalls of a Gefreiter mechanic in order to avoid
interrogation and get home more easily. At Salzburg-Ainring, our
principal concerns were food and shelter. The last drops of fuel were siphoned
off from the tanks of the numerous abandoned aircraft.."