Spawning units invincibility

hi desert strike team,

first i would like to thank you for this map, its awesome and i think it deserves to be on the top10 custom map ranking.
but one thing i would like to recommend is that the spawning units are for 0.5 or 1 seconds invincible because if the enemy got tanks or colossus in the mix, one shot nearly drain half of your units life because they are all stacked at the pf.
so the invincibility will garantee that your units survive that first AOE damage so they can rearrange and maybe defend that attack.