Fallout Shelter - Wasteland
Exploring the wasteland is the best way to gain new weapons & armour, I usually send dwellers out in the morning armed with 10 stimpacks & 5 radaways. Monitoring their progress during the day a few times & then usually before bed if they are down to a few stimpacks I recall them back to the vault.
Currently I'm on 62 dwellers now & I have 4 dwellers constantly wandering the wasteland for loot.
I've unlocked all the training rooms & just saving the caps to start building a nuclear reactor.