someone can decode that ?

They are considered military if they are in the reserves. To me, it looks as though they may have used their vacation time to get paid but I don't believe they have to do that (employers are not allowed to make them do that and they don't pay them while in training either). Maybe this person's employer does but that isn't and shouldn't be the issue. The person will get paid by the Army Reserves regardless. So if they were paid by the Army and were paid by their employer (even if only for two weeks) they would be two weeks "ahead". However - I'm sure they may not make as much from the Reserves so that could be their issue?

The SCRA only applies if a member of the military changes duty station (i.e. a PCS move) or is deployed. The typical situation is a reservist/national guard member is activated for a period of 3 months - 12+ months.

This does NOT sound like what you're asking. You're curious why his income changes and what if any issues that would cause with paying his rent.

I've been a national guardsman for 22 years, roughly equivalent to reserves in terms of duty and pay. So I know a few things... ;-)

What he's telling you is during August, he received pay from BOTH is civilian employer AND the military (DFAS handles military pay). He should be able to provide a copy of both his civilian pay stubs and his LES (Leaving and Earning Statement) from the military to confirm his pay.

This is typical for Reservists/Guardsmen. We do one weekend "drill" per month and then have a 2 week "camp" for training and doing larger scale training exercises. Some civilian employers are extra generous and continue to pay their military members even when they're on military duty. Others don't. It's not a legal requirement. the only legal requirement employers have is to give their employees time off so they can attend their mandatory training. So if he's able to get both pay checks from military and civilian job, then that's a big bonus for him.

P.S. The SCRA generally applies when a military member is in a rental lease. It allows them to terminate a lease early with no penalty due to change in duty location. They have to provide the land lord a copy of the orders and give a 30 days written notice.

SCRA is not intended to allow them to stay in your home for free and pay no rent. There are a few exceptions and some good info to find out, but generally speaking they will still owe rent and can be evicted in you follow the correct procedure.