The ones in that picture are Ensigns in PT gear. The green on green are the 2ndLts. They halted them there, undid the carts, new Plebes grabbed their bags, then turned them over to detailers waiting at the top of the stairs for them (which are directly behind them).
USNA does things slightly different then the other SAs as far as the 'welcoming'. I Day from reporting to the oath is very rapid like the others, but there is no dramatic reporting to the Cadet in the red sash or footprints. New Plebes won't actually interact with detailers until they get to Bancroft. Alumni is all new Ensigns and Lts. There is no screaming, it's very rapid with loud voices, but they won't be dropped or screamed at. The dramatic part starts the minute the doors close after they march in. They have been sworn in and are now Midshipmen and all heck breaks loose then. It is why you have seen a few parents post that their kids were a little confused that they hadn't been yelled at yet when they see them at the oath. That all changes the minute they get back in Bancroft. USNA has been for decades very selective where Mids can be dropped and screamed at... Bancroft is the sanctuary of misery for all this.