Spios get +1 for sweepers and another +1 for vet2.
Are you sure katitof? I've red that the vet2 or 3 for sturmpios is currently not working/bugged(25% faster build time etc.) and someone from relic posted, that the sweeper does not affect the repair speed anymore.
Ontopic:
A munition upgrade cost for the AA truck, does not hurt.