Equipment:Even though the Eastern Front had received 1.1 million replacements since 22 June 1941, it was short 625,000 men as of 1 May 1942. Army Group South had 50 percent of its original infantry strength; Army Groups Center and North each 35 percent. Army Group South could be fully replenished by the time the summer offensive began, but it would take until August to bring Center and North up to 55 percent of their original infantry strengths. Reserves in the form of new units could not be created. All of the men, weapons, and equipment becoming available in the summer, including the 1923 class of recruits, would have to be used to replace losses. The forces on the Eastern Front would have a solid core of veterans, but they would have to absorb large numbers of what formerly would have been regarded as underage and overage recruits, and owing to the losses during the winter, they would be short on experienced officers and noncommissioned officers.
The Germans' own count was 3.9 million men in the ground forces, distributed as follows: 2.6 million (allies not counted) on the Eastern Front proper, 212,000 in the occupied Soviet territory, 150,000 in Finland, and 1.3 million in the occupied territories outside the Soviet Union, in the Replacement Army in Germany, and in North Africa.
Source: https://www.ibiblio.org/hyperwar/USA/US ... .html#cn90During the winter, the forces on the Eastern Front had lost nearly 7,000 artillery pieces ranging from 37-mm. antitank guns to 210-mm. howitzers. The new production, restarted in January, could not replace more than part of them. Of close to 75,000 motor transport vehicles lost, only 7,500 had been replaced; another 25,000 could be secured in Germany, but the absolute deficit would still be 42,500. More than 179,000 horses had died, and only 20,000 new animals had been secured. The 176 million gallons of motor fuel and 390,000 tons of ammunition consumed had cut deep into the stockpiles, which would therefore be proportionately smaller in 1942. The conclusion was, "The shortages cannot, for the time being, be covered by new production or by rebuilding. This will compel cutbacks and sharp emphasis on priorities in all areas."
As an "accomplishment" in sustaining firepower in spite of curtailed production, the army had sent to the Eastern Front 725,000 rifles, 27,000 machine guns, 2,700 antitank guns, and 559 pieces of light and 350 pieces of heavy field artillery. The weapons requirements for Army Group South would be "substantially" met by the time operations resumed. Army Groups Center and North would have enough infantry weapons to arm the troops they had, but their artillery batteries would have to be reduced from 4 to 3 guns and some of those would have to be old or captured pieces. All told, 3,300 tanks would be on hand in the East, 360 less than in June 1941, but heavier armament would make up the difference.
The air force reported some decline in numbers of aircraft, compensated for by newer models, better armament, and more experienced crews.51 In fact, the air strength in the East, 2,750 planes, would not be substantially less than it had been in June 1941 (2,770 planes), and a larger proportion (1,500) would be assigned to support Army Group South