September 30, 2013 was the last day to use or lose leave at the extended 75 day limit. Service members are reminded that the policy for leave carryover will return to 60 days at the end of FY13. If you are in excess of 60 days of accrued annual leave on September 30, 2013, those excess days will be lost.
It is recommended that service members check their LES’s to maintain correct accounting of leave.
There is still plenty of time remaining for taking leave days in excess of 60, but less than 75. 75 days is the use/lose limit until Sep 2015, according to ALARACT 022/1213. Here's the link to the message.
In response to the actual question, I feel that any supervisor worthy of leading should identify Soldiers who have use/lose well in advance, like at the beginning of the FY. This can be done easily by checking LESs, something which many of my friends don't even do for themselves, let alone their subordinates. When you identify those with use/lose leave, maximize their oportunity to take it by having a training calendar which identifies leave periods at least three months out (should be six, but I rarely see it), and counsel the Soldier on the consequences of not taking their leave. If there is not an opportunity for a Soldier to take their leave, the unit can submit paperwork to allow them to keep it, but that isn't likely if a Soldier is making a decision not to use their available leave.