Fwiw, when AF called to offer class he specifically asked what my mil status would be on Indoc start date. He specifically asked if I would be retired or on terminal. He went on to say going to Indoc in leave and going back to work to out process was a no go. They even had paperwork to sign confirming you didn't have any mil obligations in the next 3-6 months. They've been burned by guard/res guys dropping long term orders right after Indoc and have even terminated a few because they didn't follow adequate notice. Tread lightly.
I've flown with more than one capt/lca that said, "whatever you do, don't lie to delta...if you screw up just own it and come clean". If you want to start your multimillion dollar career by lying to gain a few spots of seniority you are taking a big risk.