Just for clarity (and management of expectations) - The GBU-39, which makes up the explosive portion of the GLSBD, has just 200lbs of explosive mass so, whilst it's double the amount in a typical HIMARS/M270 M31 variant rocket, it's very, very small for an aircraft dropped bomb (1/2 the size of the smallest current US/UK dropped bombs) so these won't be used to pound open front line defences as the warhead is just too small to have any decent effect on mass trenches etc when the amount that can be fired is tiny. Thats the artilleries job, to pound thousands of shells into fortifications day after day i.e just four 155mm Artillery rounds, of which there are literally millions, has the same explosive impact as a single GLSBD of which there are a tiny number.
Instead, just like HIMARS/M270, I think it'll be used for strikes on HQ's, supplies, ammo dumps, vehicle parks etc, but I think their success will heavily depend on how well Russia has adapted post-HIMAR/M270 introduction, as we saw good effects from these weapons when they were new and unknown but now we see very little as Russia "seems" to be getting a grip of its military, Darwinism in a war does accelerate that learning process very quickly.
Russia according to ukraine Intel has pushed its hqs and supply depots to 120km from front line outside of HIMARS range that's where there isn't so much boom boom video anymore.
HIMARS is being used to hit trenches and front lines right now, there isn't much else for them to do, but they are using a specialised warhead for the job that deposits 180,000 metal balls into the air and not the 90kg HE warhead they were using to hit depots, HQs and bridges.
GLSDB is in low supply as you've said that's why I'm not optimistic about it coming in the next package - I think even if it is announced it won't actually arrive in Ukraine for months because Boeing will need to be given a contract to start up mass production - the supplies are there at least, Boeing and the Pentagon says they have enough supplies sitting in warehouses to produce nearly 100 thousand glsdb rockets, someone just needs to give the order and pay the Paychecks
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